WO2020155902A1 - 像素驱动电路、像素驱动方法和显示装置 - Google Patents

像素驱动电路、像素驱动方法和显示装置 Download PDF

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Publication number
WO2020155902A1
WO2020155902A1 PCT/CN2019/126182 CN2019126182W WO2020155902A1 WO 2020155902 A1 WO2020155902 A1 WO 2020155902A1 CN 2019126182 W CN2019126182 W CN 2019126182W WO 2020155902 A1 WO2020155902 A1 WO 2020155902A1
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Prior art keywords
control
circuit
transistor
electrode
light
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PCT/CN2019/126182
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English (en)
French (fr)
Inventor
李胜男
高雪岭
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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Priority to US16/767,053 priority Critical patent/US11164524B2/en
Publication of WO2020155902A1 publication Critical patent/WO2020155902A1/zh
Anticipated expiration legal-status Critical
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    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • 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]
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    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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    • G09G3/22—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
    • G09G3/3241—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 the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
    • G09G3/325—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 the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror the data current flowing through the driving transistor during a setting phase, e.g. by using a switch for connecting the driving transistor to the data driver
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    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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    • G09G2320/0257—Reduction of after-image effects

Definitions

  • the present disclosure relates to the field of display technology, and in particular to a pixel driving circuit, a pixel driving method and a display device.
  • organic light-emitting diode (OLED) display products in the related technology will have afterimages after switching to a gray screen after turning on the black and white screen for a period of time, and the afterimage phenomenon will disappear after a period of time. Short-term afterimages.
  • the hysteresis effect is related to the shift of the threshold voltage of the drive transistor.
  • the present disclosure provides a pixel drive circuit.
  • the pixel drive circuit includes a drive circuit, an initialization circuit, and a compensation control circuit, wherein a first end of the drive circuit is connected to a first voltage line;
  • the initialization circuit is configured to control the initialization voltage to be written into the second end of the driving circuit under the control of the initialization control line;
  • the compensation control circuit is configured to control the communication between the control terminal of the driving circuit and the second terminal of the driving circuit under the control of the compensation control line, so as to write the initialization voltage into the control terminal of the driving circuit.
  • the second end of the drive circuit is connected to the first pole of the light-emitting element
  • the initialization circuit is further configured to, under the control of the initialization control line, control the initialization voltage to be written into the first pole of the light-emitting element, so that the light-emitting element does not emit light.
  • the pixel driving circuit described in the present disclosure further includes a light-emitting control circuit; the second end of the driving circuit is connected to the first pole of the light-emitting element through the light-emitting control circuit;
  • the light emitting control circuit is configured to control the communication between the second end of the driving circuit and the first pole of the light emitting element under the control of the light emitting control line.
  • the pixel drive circuit of the present disclosure further includes a storage circuit and a data writing circuit; the first end of the storage circuit is connected to the control end of the drive circuit; the storage circuit is configured to control all The potential of the control terminal of the drive circuit;
  • the compensation control circuit is also connected to a reference voltage line and the second end of the tank circuit, and is configured to control the reference voltage on the reference voltage line to be written into the tank under the control of the compensation control line.
  • the second end of the energy circuit is also connected to a reference voltage line and the second end of the tank circuit, and is configured to control the reference voltage on the reference voltage line to be written into the tank under the control of the compensation control line.
  • the data writing circuit is configured to write the data voltage into the second end of the tank circuit under the control of the writing control line.
  • the initialization circuit includes an initialization transistor
  • the control electrode of the initialization transistor is connected to the initialization control line, the first electrode of the initialization transistor is connected to the first electrode of the light-emitting element, and the second electrode of the initialization transistor is connected to the initialization voltage line;
  • the initialization voltage line is used to input the initialization voltage.
  • the light emission control circuit includes a light emission control transistor
  • the control electrode of the light emission control transistor is connected to the light emission control line, the first electrode of the light emission control transistor is connected to the second terminal of the drive circuit, and the second electrode of the light emission control transistor is connected to the light emitting element.
  • the first pole is connected.
  • the compensation control circuit includes a first compensation control transistor
  • the control electrode of the first compensation control transistor is connected to the compensation control line, the first electrode of the first compensation control transistor is connected to the control terminal of the drive circuit, and the second electrode of the first compensation control transistor Connected to the second end of the driving circuit.
  • the pixel driving circuit includes a tank circuit; the compensation control circuit further includes a second compensation control transistor;
  • the control electrode of the second compensation control transistor is connected to the compensation control line, the first electrode of the second compensation control transistor is connected to the reference voltage line, and the second electrode of the second compensation control transistor is connected to the The second end of the tank circuit is connected.
  • the energy storage circuit includes a storage capacitor
  • the first end of the storage capacitor is the first end of the tank circuit, and the second end of the storage capacitor is the second end of the tank circuit.
  • the driving circuit includes a driving transistor; the control terminal of the driving transistor is the control terminal of the driving circuit, the first terminal of the driving transistor is the first terminal of the driving circuit, and the second terminal of the driving transistor is It is the second end of the driving circuit.
  • the data writing circuit includes a data writing transistor; the control electrode of the data writing transistor is connected to the writing control line, the first electrode of the data writing transistor is connected to the data line, the The second pole of the data writing transistor is connected to the second end of the storage capacitor; the data line is used for inputting a data voltage.
  • the present disclosure also provides a pixel circuit including a light-emitting element, a storage capacitor, a driving transistor, an initialization transistor, a light-emitting control transistor, a first compensation control transistor, a second compensation control transistor, and a data writing transistor;
  • the control electrode of the initialization transistor is connected to an initialization control line, the first electrode of the initialization transistor is connected to the first electrode of the light-emitting element, and the second electrode of the initialization transistor is connected to an initialization voltage line; the initialization voltage The line is used to input the initialization voltage;
  • the control electrode of the light emission control transistor is connected to the light emission control line, the first electrode of the light emission control transistor is connected to the second electrode of the driving transistor, and the second electrode of the light emission control transistor is connected to the second electrode of the light emitting element.
  • One pole is connected; the second pole of the light-emitting element is connected with the second voltage line;
  • the control electrode of the first compensation control transistor is connected to the compensation control line, the first electrode of the first compensation control transistor is connected to the control electrode of the driving transistor, and the second electrode of the first compensation control transistor is connected to the The second electrode of the driving transistor is connected; the first electrode of the driving transistor is connected to the first voltage line;
  • the control electrode of the second compensation control transistor is connected to the compensation control line, the first electrode of the second compensation control transistor is connected to the reference voltage line, and the second electrode of the second compensation control transistor is connected to the storage
  • the second end of the capacitor is connected; the first end of the storage capacitor is connected to the control electrode of the drive transistor;
  • the control electrode of the data writing transistor is connected to the writing control line, the first electrode of the data writing transistor is connected to the data line, and the second electrode of the data writing transistor is connected to the second end of the storage capacitor. Connection;
  • the data line is used to input data voltage.
  • the present disclosure also provides a pixel driving method, which is applied to the above-mentioned pixel driving circuit or pixel circuit, and the pixel driving method includes:
  • the initialization circuit controls the initialization voltage to be written into the second terminal of the drive circuit under the control of the initialization control line;
  • the compensation control circuit controls the control terminal of the drive circuit and all the terminals under the control of the compensation control line.
  • the second terminals of the driving circuit are connected, so that the initialization voltage is written into the control terminal of the driving circuit.
  • the pixel driving circuit further includes a light emitting control circuit, and the second end of the driving circuit is connected to the first pole of the light emitting element through the light emitting control circuit; the pixel driving method further includes:
  • the light-emitting control circuit controls the communication between the second end of the driving circuit and the first pole of the light-emitting element under the control of the light-emitting control line.
  • a compensation phase and a light-emitting phase are further provided after the initialization phase;
  • the pixel driving circuit further includes a storage circuit and a data writing circuit;
  • the compensation control circuit is also connected to a reference voltage line and the storage circuit
  • the driving circuit includes a driving transistor, the control terminal of the driving transistor is the control terminal of the driving circuit, the first terminal of the driving transistor is the first terminal of the driving circuit, the driving transistor The second pole of the second end of the drive circuit;
  • the pixel driving method further includes:
  • the data writing circuit writes the data voltage to the second end of the tank circuit under the control of the writing control line; the compensation control circuit controls the data under the control of the compensation control line
  • the control electrode of the driving transistor is connected to the second electrode of the driving transistor, and under the control of its control electrode, the driving transistor conducts the first end of the driving transistor and the second electrode of the driving transistor.
  • connection between the electrodes is charged to the tank circuit with the first voltage V1 input through the first voltage line until the potential of the control electrode of the drive transistor is V1+Vth, and the drive transistor disconnects its first end from The connection between the second pole of the driving transistor; the light-emitting control circuit, under the control of the light-emitting control line, controls the disconnection between the second pole of the driving transistor and the first pole of the light-emitting element Connection; Vth is the threshold voltage of the drive transistor.
  • the compensation control circuit writes a reference voltage into the second end of the tank circuit under the control of the compensation control line, and the light-emission control circuit controls
  • the second electrode of the driving transistor is connected to the first electrode of the light-emitting element, and the driving transistor drives the light-emitting element to emit light.
  • the pixel driving method described in the present disclosure further includes:
  • the initialization circuit controls to write the initialization voltage to the first pole of the light-emitting element, so that the light-emitting element does not emit light;
  • the initialization circuit under the control of the initialization control line, controls to stop writing the initialization voltage to the first pole of the light-emitting element.
  • the present disclosure also provides a display device including the above-mentioned pixel driving circuit or pixel driving circuit.
  • FIG. 1A is a structural diagram of a pixel driving circuit according to some embodiments of the present disclosure.
  • FIG. 1B is a structural diagram of a pixel driving circuit according to some embodiments of the present disclosure.
  • FIG. 2 is a structural diagram of a pixel driving circuit according to some embodiments of the present disclosure
  • FIG. 3 is a circuit diagram of a specific embodiment of the pixel driving circuit of the present disclosure.
  • FIG. 4 is a working timing diagram of the specific embodiment of the pixel driving circuit of the present disclosure.
  • FIG. 5 is a schematic diagram of the working state of the specific embodiment of the pixel driving circuit of the present disclosure in the initialization phase T1;
  • FIG. 6 is a schematic diagram of the working state of the specific embodiment of the pixel driving circuit of the present disclosure in the compensation stage T2;
  • FIG. 7 is a schematic diagram of the working state of the specific embodiment of the pixel driving circuit of the present disclosure in the light-emitting phase T3.
  • the transistors used in all the embodiments of the present disclosure may be triodes, thin film transistors or field effect transistors or other devices with the same characteristics.
  • one of the poles is called the first pole and the other pole is called the second pole.
  • the control electrode when the transistor is a triode, can be a base electrode, the first electrode can be a collector, and the second electrode can be an emitter; or, the control electrode can be a base.
  • the first electrode may be an emitter electrode, and the second electrode may be a collector electrode.
  • the control electrode when the transistor is a thin film transistor or a field effect transistor, the control electrode may be a gate, the first electrode may be a drain, and the second electrode may be a source; or The control electrode may be a gate, the first electrode may be a source, and the second electrode may be a drain.
  • the technical solution to improve the short-term image retention problem caused by the hysteresis effect is as follows: by charging and discharging the driving transistor multiple times in the initial stage, and not turning on the light-emitting control transistor to emit light during this process, After the driving transistor is stabilized, light will be emitted to improve the short-term afterimage problem.
  • the above-mentioned solution for improving the short-term image retention problem caused by the hysteresis effect uses a large number of transistors and a complicated operation process.
  • the pixel drive circuit As shown in FIG. 1A, the pixel drive circuit according to some embodiments of the present disclosure is used to drive the light-emitting element EL.
  • the pixel drive circuit includes a drive circuit 11, an initialization circuit 13, and a compensation control circuit 14, wherein the drive The first end of the circuit 11 is connected to the first voltage line VL1, and the second end of the driving circuit 11 is connected to the first pole of the light-emitting element EL;
  • the second pole of the light emitting element EL is connected to the second voltage line VL2;
  • the initialization circuit 13 is configured to control the initialization voltage Vint to be written into the first pole of the light-emitting element EL under the control of the initialization control line Ctrl, so that the light-emitting element EL does not emit light;
  • the initialization circuit 13 is further configured to control the initialization voltage Vint to be written into the second end of the driving circuit 11 under the control of the initialization control line Ctrl;
  • the compensation control circuit 14 is configured to control the communication between the control terminal of the drive circuit 11 and the second terminal of the drive circuit 11 under the control of the compensation control line Comp(n) to write the initialization voltage Vint The control terminal of the drive circuit 11, so that the drive circuit 11 controls the connection between the first terminal of the drive circuit 11 and the second terminal of the drive circuit 11 under the control of the control terminal .
  • the initialization control line Ctrl may be the compensation control line Comp(n), but it is not limited to this.
  • the pixel driving circuit described in some embodiments of the present disclosure adopts the initialization circuit 13 and the compensation control circuit 14, so that the control terminal of the control driving circuit 11 is connected to the initialization voltage Vint during the initialization phase, so that the driving transistor included in the driving circuit 11 is turned on.
  • the on-bias state therefore, regardless of the data voltage when the previous frame of the picture is displayed corresponds to a black picture or a white picture, the driving transistor included in the driving circuit 11 performs data writing and threshold compensation by the on-bias state, So as to improve the short-term afterimage caused by the hysteresis effect.
  • the initialization circuit 13 makes the electric potential of the first electrode of the light-emitting element EL the initialization voltage Vint, so as to initialize the electric potential of the first electrode of the light-emitting element EL, so that light is emitted during the initialization phase.
  • the element does not emit light, and the influence of the electric charge remaining on the first electrode of the light-emitting element EL on the light-emitting brightness is avoided.
  • the second voltage line VL2 may be a low voltage line or a ground line, but it is not limited to this.
  • the light-emitting element EL may be an organic light-emitting diode
  • the first electrode of the light-emitting element EL may be the anode of the organic light-emitting diode
  • the second electrode of the light-emitting element EL may be the cathode of the organic light-emitting diode. But not limited to this.
  • the initialization circuit 13 controls the initialization voltage Vint to be written into the first pole of the light-emitting element EL under the control of the initialization control line Ctrl, so that the light-emitting element EL does not emit light; Under control, the initialization voltage Vint is controlled to be written into the second end of the driving circuit 11; the compensation control circuit 14 is controlled by the compensation control line Comp(n) to control the control end of the driving circuit 11 and the The second terminals of the driving circuit 11 are connected to each other, so that the initialization voltage Vint is written into the control terminal of the driving circuit 11.
  • the driving circuit 11 conducts the first terminal of the driving circuit 11 under the control of its control terminal. The connection with the second end of the driving circuit 11.
  • the pixel driving circuit described in some embodiments of the present disclosure may further include a light-emitting control circuit; the second end of the driving circuit is connected to the first pole of the light-emitting element through the light-emitting control circuit;
  • the light emitting control circuit is configured to control the communication between the second end of the driving circuit and the first pole of the light emitting element under the control of the light emitting control line.
  • the pixel driving circuit may further include a light emitting control circuit to control to turn on or off the second end of the driving circuit and the first light emitting element under the control of the light emitting control line. The connection between the poles.
  • the pixel driving circuit described in some embodiments of the present disclosure may further include a light emission control circuit 12;
  • the second end of the driving circuit 11 is connected to the first electrode of the light-emitting element EL through the light-emitting control circuit 12;
  • the light emitting control circuit 12 is configured to control the communication between the second end of the driving circuit 11 and the first pole of the light emitting element EL under the control of the light emitting control line EM(n).
  • the light-emitting control circuit 12 controls the second end of the driving circuit 11 and the second terminal under the control of the light-emitting control line EM(n).
  • the first poles of the light emitting element EL communicate with each other.
  • the pixel driving circuit described in the present disclosure may further include a tank circuit and a data writing circuit; the first terminal of the tank circuit is connected to the control terminal of the driving circuit; the tank circuit is configured To control the potential of the control terminal of the drive circuit;
  • the compensation control circuit is also connected to a reference voltage line and the second end of the tank circuit, and is configured to control the reference voltage on the reference voltage line to be written into the tank under the control of the compensation control line.
  • the second end of the energy circuit is also connected to a reference voltage line and the second end of the tank circuit, and is configured to control the reference voltage on the reference voltage line to be written into the tank under the control of the compensation control line.
  • the data writing circuit is configured to write the data voltage into the second end of the tank circuit under the control of the writing control line.
  • the pixel driving circuit may further include a tank circuit and a data writing circuit, and the compensation control circuit is also connected to the reference voltage line and the second end of the tank circuit to implement data writing and threshold value. Compensation function.
  • the pixel driving circuit described in some embodiments of the present disclosure further includes a storage circuit 15 and a data writing circuit 16;
  • the first terminal of the tank circuit 15 is connected to the control terminal of the drive circuit 11; the tank circuit is configured to control the potential of the control terminal of the drive circuit 11;
  • the compensation control circuit 14 is also connected to a reference voltage line and the second end of the tank circuit 15, and is configured to control the reference voltage line on the reference voltage line under the control of the compensation control line Comp(n) The voltage Vref is written into the second end of the tank circuit 15;
  • the data writing circuit 16 is configured to write the data voltage Vdata into the second end of the tank circuit 15 under the control of the writing control line CW.
  • the write control line CW may be the compensation control line Comp(n), but it is not limited to this.
  • the driving circuit 11 includes a driving transistor, and the control of the driving transistor is very different.
  • the control terminal of the drive circuit, the first terminal of the drive transistor is the first terminal of the drive circuit, and the second terminal of the drive transistor is the second terminal of the drive circuit;
  • the data writing circuit 16 writes the data voltage Vdata into the second end of the tank circuit 15 under the control of the writing control line CW; the compensation control circuit 14 is in the compensation control line Under the control of Comp(n), the control electrode of the driving transistor is controlled to communicate with the second electrode of the driving transistor. Under the control of its control electrode, the driving transistor turns on the first electrode of the driving transistor.
  • the connection between the electrode and the second electrode of the drive transistor is charged to the tank circuit 15 with the first voltage V1 input through the first voltage line VL1 until the potential of the control electrode of the drive transistor is V1+Vth,
  • the driving transistor disconnects the connection between its first terminal and the second terminal of the driving transistor;
  • the light emission control circuit 12 controls to turn off the first terminal of the driving transistor under the control of the light emission control line EM(n)
  • the initialization circuit 13 is controlled by the initialization control line Ctrl to control the initialization voltage Vint to be written into the first pole of the light-emitting element EL. Pole, so that the light-emitting element EL does not emit light;
  • Vth is the threshold voltage of the driving transistor;
  • the initialization circuit 13 controls to stop writing the initialization voltage Vint to the first pole of the light-emitting element EL under the control of the initialization control line Ctrl; the compensation control circuit 14 is Under the control of the compensation control line Comp(n), the reference voltage Vref is written into the second end of the tank circuit 15, and the light emission control circuit 12 is controlled by the light emission control line EM(n) to control the
  • the second electrode of the driving transistor communicates with the first electrode of the light-emitting element EL, and the driving transistor drives the light-emitting element EL to emit light.
  • the initialization circuit may include an initialization transistor
  • the control electrode of the initialization transistor is connected to the initialization control line, the first electrode of the initialization transistor is connected to the first electrode of the light-emitting element, and the second electrode of the initialization transistor is connected to inputting the initialization voltage
  • the initialization voltage line is connected.
  • the light emission control circuit may include a light emission control transistor
  • the control electrode of the light emission control transistor is connected to the light emission control line, the first electrode of the light emission control transistor is connected to the second terminal of the drive circuit, and the second electrode of the light emission control transistor is connected to the light emitting element.
  • the first pole is connected.
  • the compensation control circuit may include a first compensation control transistor
  • the control electrode of the first compensation control transistor is connected to the compensation control line, the first electrode of the first compensation control transistor is connected to the control terminal of the drive circuit, and the second electrode of the first compensation control transistor Connected to the second end of the driving circuit.
  • the compensation control circuit may further include a second compensation control transistor
  • the control electrode of the second compensation control transistor is connected to the compensation control line, the first electrode of the second compensation control transistor is connected to the reference voltage line, and the second electrode of the second compensation control transistor is connected to the The second end of the tank circuit is connected.
  • the storage circuit may include a storage capacitor;
  • the driving circuit may include a driving transistor;
  • the data writing circuit may include a data writing transistor;
  • the first end of the storage capacitor is the first end of the energy storage circuit, and the second end of the storage capacitor is the second end of the energy storage circuit;
  • the control terminal of the drive transistor is the control terminal of the drive circuit
  • the first terminal of the drive transistor is the first terminal of the drive circuit
  • the second terminal of the drive transistor is the second terminal of the drive circuit
  • the control electrode of the data writing transistor is connected to the writing control line, the first electrode of the data writing transistor is connected to the data line, and the second electrode of the data writing transistor is connected to the first electrode of the storage capacitor. Two-terminal connection; the data line is used to input data voltage.
  • the light-emitting element may be an organic light-emitting diode; the first electrode of the light-emitting element is the anode of the organic light-emitting diode, and the second electrode of the light-emitting element is the cathode of the organic light-emitting diode.
  • a specific embodiment of the pixel driving circuit described in the present disclosure is used to drive an organic light emitting diode OLED.
  • the specific embodiment of the pixel driving circuit includes a driving circuit, a light emission control circuit, an initialization circuit, and a compensation circuit. Control circuit, energy storage circuit and data writing circuit;
  • the initialization circuit includes an initialization transistor M5; the light emission control circuit includes a light emission control transistor M6; the compensation control circuit may include a first compensation control transistor M2 and a second compensation control transistor M1; the storage circuit includes a storage capacitor Cst
  • the driving circuit includes a driving transistor M3; the data writing circuit includes a data writing transistor M4;
  • the cathode of the organic light emitting diode OLED is connected to a low voltage ELVSS;
  • the gate of the initialization transistor M5 is connected to the compensation control line Comp(n), the source of the initialization transistor M5 is connected to the anode of the organic light emitting diode OLED, and the drain of the initialization transistor M5 is connected to the input device.
  • the gate of the emission control transistor M6 is connected to the emission control line EM(n), the drain of the emission control transistor M6 is connected to the drain of the driving transistor M3, and the source of the emission control transistor M6 Connected with the anode of the organic light emitting diode OLED;
  • the gate of the driving transistor M3 is connected to the first end of the storage capacitor Cst, and the source of the driving transistor M3 is connected to the power supply voltage ELVDD;
  • the gate of the first compensation control transistor M2 is connected to the compensation control line Comp(n), the source of the first compensation control transistor M2 is connected to the gate of the driving transistor M3, and the first compensation The drain of the control transistor M2 is connected to the drain of the drive transistor M3;
  • the gate of the second compensation control transistor M1 is connected to the compensation control line Comp(n), the source of the second compensation control transistor M1 is connected to the reference voltage line for inputting the reference voltage Vref, and the first The drain of the second compensation control transistor M1 is connected to the second end of the storage capacitor Cst;
  • the gate of the data writing transistor M4 is connected to the compensation control line Comp(n), the drain of the data writing transistor M4 is connected to the data voltage Vdata, and the source of the data writing transistor M4 is connected to the The second end A of the storage capacitor Cst is connected.
  • the first voltage line is the power supply voltage line inputting ELVDD
  • the second voltage line is the low voltage line inputting ELVSS, but not limited to this.
  • M1 and M3 are PMOS tubes (P-type metal-oxide-semiconductor field effect transistors), M2, M4, M5 and M6 are NMOS tubes (N-type metal-oxide-semiconductor Field effect transistor), but not limited to this.
  • node A is a node connected to the second end of Cst
  • node B is a node connected to the first end of Cst
  • node C is a node connected to the anode of the OLED
  • node D Is the node connected to the source of M3.
  • both the initialization control line and the write control line are the compensation control line Comp(n), but it is not limited thereto.
  • the electric potential of D is ELVDD, and M3 is in the conducting state, so that regardless of the data voltage corresponding to black or white in the display time of the previous frame, M3 is in the conducting state for data writing and threshold compensation, which can improve the hysteresis effect.
  • Short-term residual image problem and connect the anode of OLED to Vint, so that the OLED does not emit light, and avoid the influence of the electric charge remaining on the anode of OLED on the brightness of light emission;
  • Comp(n) inputs a high level and EM(n) inputs a low level.
  • M1 and M6 are turned off, M2, M3, M4 and M5 are turned on, and Vdata is written to node A.
  • Vint acts on node C through M5, so that OLED does not emit light
  • ELVDD acts on node B through M2 and M3 to charge Cst, thereby increasing the potential of node B until the potential of node B Rising to ELVDD+Vth, Vth is the threshold voltage of M3, at this time the potential of node D is ELVDD;
  • Vgs is the gate-source voltage of M3. From the above formula, Ioled has nothing to do with ELVDD and Vth. Thereby, the short-term afterimage caused by the drift of the threshold voltage of the driving transistor is eliminated, and the display effect is improved.
  • the pixel driving method is applied to the above-mentioned pixel driving circuit, and the pixel driving method includes:
  • the initialization circuit under the control of the initialization control line, controls the initialization voltage to be written to the first pole of the light-emitting element, so that the light-emitting element does not emit light;
  • the compensation control circuit is controlled by the compensation control line to control the The control terminal of the driving circuit is connected with the second terminal of the driving circuit, so that the initialization voltage is written into the control terminal of the driving circuit, so that the driving circuit, under the control of the control terminal, turns on the The connection between the first end of the drive circuit and the second end of the drive circuit.
  • the light-emitting control circuit controls the communication between the second end of the driving circuit and the first pole of the light-emitting element under the control of the light-emitting control line.
  • the pixel driving circuit further includes a storage circuit and a data writing circuit;
  • the compensation control circuit is also connected to a reference voltage line and the storage circuit
  • the driving circuit includes a driving transistor, the control terminal of the driving transistor is the control terminal of the driving circuit, the first terminal of the driving transistor is the first terminal of the driving circuit, the driving transistor The second pole of the second end of the drive circuit;
  • the pixel driving method may further include:
  • the data writing circuit writes the data voltage to the second end of the tank circuit under the control of the writing control line; the compensation control circuit controls the data under the control of the compensation control line
  • the control electrode of the driving transistor is connected to the second electrode of the driving transistor, and under the control of its control electrode, the driving transistor conducts the first electrode of the driving transistor and the second electrode of the driving transistor.
  • connection between the electrodes is charged to the tank circuit with the first voltage V1 input through the first voltage line until the potential of the control electrode of the driving transistor is V1+Vth, and the driving transistor disconnects its first electrode from The connection between the second pole of the driving transistor; the light-emitting control circuit, under the control of the light-emitting control line, controls the disconnection between the second pole of the driving transistor and the first pole of the light-emitting element Connected; Vth is the threshold voltage of the drive transistor;
  • the compensation control circuit writes a reference voltage into the second terminal of the tank circuit under the control of the compensation control line, so that the potential of the first terminal of the tank circuit corresponds to Changed
  • the light emission control circuit controls the communication between the second electrode of the driving transistor and the first electrode of the light emitting element under the control of the light emitting control line
  • the driving transistor drives the light emitting element to emit light.
  • the pixel driving method described in some embodiments of the present disclosure may further include:
  • the initialization circuit controls to write the initialization voltage to the first pole of the light-emitting element, so that the light-emitting element does not emit light;
  • the initialization circuit under the control of the initialization control line, controls to stop writing the initialization voltage to the first pole of the light-emitting element.
  • the display device includes the aforementioned pixel driving circuit and pixel circuit.
  • the display device may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, and the like.

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Abstract

一种像素驱动电路、像素驱动方法和显示装置，像素驱动电路包括驱动电路（11）、初始化电路（13）和补偿控制电路（14），补偿控制电路（14）配置为在补偿控制线（Comp（n））的控制下，控制驱动电路（11）的控制端与驱动电路（14）的第二端之间连通；初始化电路（13）配置为在初始化控制线（Ctrl）的控制下，控制将初始化电压（Vint）写入驱动电路（11）的第二端。

Description

像素驱动电路、像素驱动方法和显示装置
相关申请的交叉引用
本申请主张在2019年1月29日在中国提交的中国专利申请号No.201910085298.3的优先权，其全部内容通过引用包含于此。
技术领域
本公开涉及显示技术领域，尤其涉及一种像素驱动电路、像素驱动方法和显示装置。
背景技术
由于驱动晶体管的迟滞效应，相关技术中的有机发光二极管(Organic Light-Emitting Diode,OLED)显示产品在点亮黑白画面一段时间后切换到灰色画面会有残像，一段时间后残像现象会消失，即短期残像。其中，迟滞效应与驱动晶体管的阈值电压的偏移有关。
发明内容
本公开提供了一种像素驱动电路，所述像素驱动电路包括驱动电路、初始化电路和补偿控制电路，其中，所述驱动电路的第一端与第一电压线连接；
所述初始化电路配置为在初始化控制线的控制下，控制将初始化电压写入所述驱动电路的第二端；
所述补偿控制电路配置为在补偿控制线的控制下，控制所述驱动电路的控制端与所述驱动电路的第二端之间连通，以将初始化电压写入所述驱动电路的控制端。
实施时，所述驱动电路的第二端与发光元件的第一极连接，
所述初始化电路还配置为在初始化控制线的控制下，控制将初始化电压写入所述发光元件的第一极，以使得所述发光元件不发光。
实施时，本公开所述的像素驱动电路还包括发光控制电路；所述驱动电路的第二端通过所述发光控制电路与所述发光元件的第一极连接；
所述发光控制电路配置为在发光控制线的控制下，控制所述驱动电路的第二端与所述发光元件的第一极之间连通。
实施时，本公开所述的像素驱动电路还包括储能电路和数据写入电路；所述储能电路的第一端与所述驱动电路的控制端连接；所述储能电路配置为控制所述驱动电路的控制端的电位；
所述补偿控制电路还与参考电压线和所述储能电路的第二端连接，配置为在所述补偿控制线的控制下，控制将所述参考电压线上的参考电压写入所述储能电路的第二端；
所述数据写入电路配置为在写入控制线的控制下，将数据电压写入所述储能电路的第二端。
实施时，所述初始化电路包括初始化晶体管；
所述初始化晶体管的控制极与所述初始化控制线连接，所述初始化晶体管的第一极与所述发光元件的第一极连接，所述初始化晶体管的第二极与初始化电压线连接；所述初始化电压线用于输入所述初始化电压。
实施时，所述发光控制电路包括发光控制晶体管；
所述发光控制晶体管的控制极与所述发光控制线连接，所述发光控制晶体管的第一极与所述驱动电路的第二端连接，所述发光控制晶体管的第二极与所述发光元件的第一极连接。
实施时，所述补偿控制电路包括第一补偿控制晶体管；
所述第一补偿控制晶体管的控制极与所述补偿控制线连接，所述第一补偿控制晶体管的第一极与所述驱动电路的控制端连接，所述第一补偿控制晶体管的第二极与所述驱动电路的第二端连接。
实施时，所述像素驱动电路包括储能电路；所述补偿控制电路还包括第二补偿控制晶体管；
所述第二补偿控制晶体管的控制极与所述补偿控制线连接，所述第二补偿控制晶体管的第一极与所述参考电压线连接，所述第二补偿控制晶体管的第二极与所述储能电路的第二端连接。
实施时，所述储能电路包括存储电容；
所述存储电容的第一端为所述储能电路的第一端，所述存储电容的第二 端为所述储能电路的第二端。
实施时，所述驱动电路包括驱动晶体管；所述驱动晶体管的控制极为所述驱动电路的控制端，所述驱动晶体管的第一极为所述驱动电路的第一端，所述驱动晶体管的第二极为所述驱动电路的第二端。
实施时，所述数据写入电路包括数据写入晶体管；所述数据写入晶体管的控制极与所述写入控制线连接，所述数据写入晶体管的第一极与数据线连接，所述数据写入晶体管的第二极与所述存储电容的第二端连接；所述数据线用于输入数据电压。
本公开还提供了一种像素电路，包括发光元件、存储电容、驱动晶体管、初始化晶体管、发光控制晶体管、第一补偿控制晶体管、第二补偿控制晶体管和数据写入晶体管；
所述初始化晶体管的控制极与初始化控制线连接，所述初始化晶体管的第一极与所述发光元件的第一极连接，所述初始化晶体管的第二极与初始化电压线连接；所述初始化电压线用于输入初始化电压；
所述发光控制晶体管的控制极与发光控制线连接，所述发光控制晶体管的第一极与所述驱动晶体管的第二极连接，所述发光控制晶体管的第二极与所述发光元件的第一极连接；所述发光元件的第二极与第二电压线连接；
所述第一补偿控制晶体管的控制极与补偿控制线连接，所述第一补偿控制晶体管的第一极与所述驱动晶体管的控制极连接，所述第一补偿控制晶体管的第二极与所述驱动晶体管的第二极连接；所述驱动晶体管的第一极与第一电压线连接；
所述第二补偿控制晶体管的控制极与所述补偿控制线连接，所述第二补偿控制晶体管的第一极与参考电压线连接，所述第二补偿控制晶体管的第二极与所述存储电容的第二端连接；所述存储电容的第一端与所述驱动晶体管的控制极连接；
所述数据写入晶体管的控制极与写入控制线连接，所述数据写入晶体管的第一极与数据线连接，所述数据写入晶体管的第二极与所述存储电容的第二端连接；所述数据线用于输入数据电压。
本公开还提供了一种像素驱动方法，应用于上述的像素驱动电路或像素 电路，所述像素驱动方法包括：
在初始化阶段，初始化电路在初始化控制线的控制下，控制将初始化电压写入所述驱动电路的第二端；补偿控制电路在补偿控制线的控制下，控制所述驱动电路的控制端与所述驱动电路的第二端之间连通，从而将初始化电压写入所述驱动电路的控制端。
实施时，所述像素驱动电路还包括发光控制电路，所述驱动电路的第二端通过所述发光控制电路与所述发光元件的第一极连接；所述像素驱动方法还包括：
在所述初始化阶段，所述发光控制电路在发光控制线的控制下，控制所述驱动电路的第二端与所述发光元件的第一极之间连通。
实施时，在所述初始化阶段之后还设置有补偿阶段和发光阶段；所述像素驱动电路还包括储能电路和数据写入电路；所述补偿控制电路还与参考电压线和所述储能电路的第二端连接；所述驱动电路包括驱动晶体管，所述驱动晶体管的控制极为所述驱动电路的控制端，所述驱动晶体管的第一极为所述驱动电路的第一端，所述驱动晶体管的第二极为所述驱动电路的第二端；
所述像素驱动方法还包括：
在所述补偿阶段，所述数据写入电路在写入控制线的控制下，将数据电压写入所述储能电路的第二端；所述补偿控制电路在补偿控制线的控制下，控制所述驱动晶体管的控制极与所述驱动晶体管的第二极之间连通，所述驱动晶体管在其控制极的控制下，导通所述驱动晶体管的第一端与所述驱动晶体管的第二极之间的连接，以通过第一电压线输入的第一电压V1向储能电路充电，直至所述驱动晶体管的控制极的电位为V1+Vth，所述驱动晶体管断开其第一端与该驱动晶体管的第二极之间的连接；所述发光控制电路在所述发光控制线的控制下，控制断开所述驱动晶体管的第二极与所述发光元件的第一极之间的连接；Vth为所述驱动晶体管的阈值电压。
在所述发光阶段，所述补偿控制电路在所述补偿控制线的控制下，将参考电压写入所述储能电路的第二端，所述发光控制电路在发光控制线的控制下，控制所述驱动晶体管的第二极与所述发光元件的第一极之间连通，所述驱动晶体管驱动所述发光元件发光。
实施时，本公开所述的像素驱动方法还包括：
在所述补偿阶段，所述初始化电路在所述初始化控制线的控制下，控制将所述初始化电压写入所述发光元件的第一极，以使得所述发光元件不发光；
在所述发光阶段，所述初始化电路在所述初始化控制线的控制下，控制停止将所述初始化电压写入所述发光元件的第一极。
本公开还提供了一种显示装置，包括上述的像素驱动电路或像素驱动电路。
附图说明
图1A是本公开的一些实施例所述的像素驱动电路的结构图；
图1B是本公开的一些实施例所述的像素驱动电路的结构图；
图2是本公开的一些实施例所述的像素驱动电路的结构图；
图3是本公开所述的像素驱动电路的一具体实施例的电路图；
图4是本公开所述的像素驱动电路的该具体实施例的工作时序图；
图5是本公开所述的像素驱动电路的该具体实施例在初始化阶段T1的工作状态示意图；
图6是本公开所述的像素驱动电路的该具体实施例在补偿阶段T2的工作状态示意图；
图7是本公开所述的像素驱动电路的该具体实施例在发光阶段T3的工作状态示意图。
具体实施方式
下面将结合本公开的一些实施例中的附图，对本公开的一些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公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
本公开所有实施例中采用的晶体管均可以为三极管、薄膜晶体管或场效应管或其他特性相同的器件。在本公开的一些实施例中，为区分晶体管除控 制极之外的两极，将其中一极称为第一极，另一极称为第二极。
在实际操作时，当所述晶体管为三极管时，所述控制极可以为基极，所述第一极可以为集电极，所述第二极可以发射极；或者，所述控制极可以为基极，所述第一极可以为发射极，所述第二极可以集电极。
在实际操作时，当所述晶体管为薄膜晶体管或场效应管时，所述控制极可以为栅极，所述第一极可以为漏极，所述第二极可以为源极；或者，所述控制极可以为栅极，所述第一极可以为源极，所述第二极可以为漏极。
本公开的一些实施例中，改善因磁滞效应产生的短期残像问题的技术方案如下：通过在初始阶段多次对驱动晶体管进行充放电动作，并且在这个过程时不打开发光控制晶体管进行发光，待到驱动晶体管稳定后进行发光，改善短期残像问题。然而，上述改善因磁滞效应产生的短期残像问题的方案采用的晶体管个数多并操作过程复杂。
如图1A所示，本公开的一些实施例所述的像素驱动电路，用于驱动发光元件EL，所述像素驱动电路包括驱动电路11、初始化电路13和补偿控制电路14，其中，所述驱动电路11的第一端与第一电压线VL1连接，所述驱动电路11的第二端与所述发光元件EL的第一极连接；
所述发光元件EL的第二极与第二电压线VL2连接；
所述初始化电路13配置为在初始化控制线Ctrl的控制下，控制将初始化电压Vint写入所述发光元件EL的第一极，以使得所述发光元件EL不发光；
所述初始化电路13还配置为在初始化控制线Ctrl的控制下，控制将初始化电压Vint写入所述驱动电路11的第二端；
所述补偿控制电路14配置为在补偿控制线Comp(n)的控制下，控制所述驱动电路11的控制端与所述驱动电路11的第二端之间连通，以将初始化电压Vint写入所述驱动电路11的控制端，以使得所述驱动电路11在所述控制端的控制下，控制导通所述驱动电路11的第一端与所述驱动电路11的第二端之间的连接。
在具体实施时，所述初始化控制线Ctrl可以为所述补偿控制线Comp(n)，但不以此为限。
本公开的一些实施例所述的像素驱动电路采用初始化电路13和补偿控 制电路14，使得在初始化阶段控制驱动电路11的控制端接入初始化电压Vint，从而驱动电路11包括的驱动晶体管处于导通偏置(on-bias)状态，因此，不论前一帧画面显示时的数据电压对应黑画面或白画面，驱动电路11包括的驱动晶体管都由导通偏置状态进行数据写入和阈值补偿，从而改善因磁滞效应产生的短期残像问题。并且，通过初始化电路13在初始化控制线Ctrl的控制下，使得发光元件EL的第一极的电位为初始化电压Vint，以对发光元件EL的第一极的电位进行初始化，能够使得在初始化阶段发光元件不发光，避免残留于发光元件EL的第一极的电荷对发光亮度的影响。在具体实施时，所述第二电压线VL2可以为低电压线或地线，但不以此为限。
在具体实施时，所述发光元件EL可以为有机发光二极管，所述发光元件EL的第一极可以为有机发光二极管的阳极，所述发光元件EL的第二极可以为有机发光二极管的阴极，但不以此为限。
本公开如图1A所示的像素驱动电路的实施例在工作时，
在初始化阶段，初始化电路13在初始化控制线Ctrl的控制下，控制将初始化电压Vint写入发光元件EL的第一极，以使得所述发光元件EL不发光；初始化电路13在初始化控制线Ctrl的控制下，控制将初始化电压Vint写入所述驱动电路11的第二端；所述补偿控制电路14在补偿控制线Comp(n)的控制下，控制所述驱动电路11的控制端与所述驱动电路11的第二端之间连通，从而将初始化电压Vint写入所述驱动电路11的控制端，所述驱动电路11在其控制端的控制下，导通所述驱动电路11的第一端与所述驱动电路11的第二端之间的连接。
在具体实施时，本公开的一些实施例所述的像素驱动电路还可以包括发光控制电路；所述驱动电路的第二端通过所述发光控制电路与所述发光元件的第一极连接；
所述发光控制电路配置为在发光控制线的控制下，控制所述驱动电路的第二端与所述发光元件的第一极之间连通。
在本公开的一些实施例中，像素驱动电路还可以包括发光控制电路，以在发光控制线的控制下，控制导通或断开所述驱动电路的第二端与所述发光元件的第一极之间的连接。
如图1B所示，在图1A所示的像素驱动电路的实施例的基础上，本公开的一些实施例所述的像素驱动电路还可以包括发光控制电路12；
所述驱动电路11的第二端通过所述发光控制电路12与所述发光元件EL的第一极连接；
所述发光控制电路12配置为在发光控制线EM(n)的控制下，控制所述驱动电路11的第二端与所述发光元件EL的第一极之间连通。
本公开如图1B所示的像素驱动电路的实施例在工作时，在初始化阶段，发光控制电路12在发光控制线EM(n)的控制下，控制所述驱动电路11的第二端与所述发光元件EL的第一极之间连通。
在具体实施时，本公开所述的像素驱动电路还可以包括储能电路和数据写入电路；所述储能电路的第一端与所述驱动电路的控制端连接；所述储能电路配置为控制所述驱动电路的控制端的电位；
所述补偿控制电路还与参考电压线和所述储能电路的第二端连接，配置为在所述补偿控制线的控制下，控制将所述参考电压线上的参考电压写入所述储能电路的第二端；
所述数据写入电路配置为在写入控制线的控制下，将数据电压写入所述储能电路的第二端。
在本公开的一些实施例中，像素驱动电路还可以包括储能电路和数据写入电路，且补偿控制电路还与参考电压线和储能电路的第二端连接，以实现数据写入和阈值补偿的功能。
如图2所示，在图1B所示的像素驱动电路的实施例的基础上，本公开的一些实施例所述的像素驱动电路还包括储能电路15和数据写入电路16；
所述储能电路15的第一端与所述驱动电路11的控制端连接；所述储能电路配置为控制所述驱动电路11的控制端的电位；
所述补偿控制电路14还与参考电压线和所述储能电路15的第二端连接，配置为在所述补偿控制线Comp(n)的控制下，控制将所述参考电压线上的参考电压Vref写入所述储能电路15的第二端；
所述数据写入电路16配置为在写入控制线CW的控制下，将数据电压Vdata写入所述储能电路15的第二端。
在具体实施时，所述写入控制线CW可以为所述补偿控制线Comp(n)，但不以此为限。
本公开如图2所示的像素驱动电路的实施例在工作时，在所述初始化阶段之后还设置有补偿阶段和发光阶段；所述驱动电路11包括驱动晶体管，所述驱动晶体管的控制极为所述驱动电路的控制端，所述驱动晶体管的第一极为所述驱动电路的第一端，所述驱动晶体管的第二极为所述驱动电路的第二端；
在所述补偿阶段，所述数据写入电路16在写入控制线CW的控制下，将数据电压Vdata写入所述储能电路15的第二端；所述补偿控制电路14在补偿控制线Comp(n)的控制下，控制所述驱动晶体管的控制极与所述驱动晶体管的第二极之间连通，所述驱动晶体管在其控制极的控制下，导通所述驱动晶体管的第一极与所述驱动晶体管的第二极之间的连接，以通过第一电压线VL1输入的第一电压V1向储能电路15充电，直至所述驱动晶体管的控制极的电位为V1+Vth，所述驱动晶体管断开其第一端与该驱动晶体管的第二端之间的连接；所述发光控制电路12在发光控制线EM(n)的控制下，控制断开所述驱动晶体管的第二极与所述发光元件EL的第一极之间的连接；所述初始化电路13在所述初始化控制线Ctrl的控制下，控制将所述初始化电压Vint写入所述发光元件EL的第一极，以使得所述发光元件EL不发光；Vth为所述驱动晶体管的阈值电压；
在所述发光阶段，所述初始化电路13在所述初始化控制线Ctrl的控制下，控制停止将所述初始化电压Vint写入所述发光元件EL的第一极；所述补偿控制电路14在所述补偿控制线Comp(n)的控制下，将参考电压Vref写入所述储能电路15的第二端，所述发光控制电路12在发光控制线EM(n)的控制下，控制所述驱动晶体管的第二极与所述发光元件EL的第一极之间连通，所述驱动晶体管驱动所述发光元件EL发光。
具体的，所述初始化电路可以包括初始化晶体管；
所述初始化晶体管的控制极与所述初始化控制线连接，所述初始化晶体管的第一极与所述发光元件的第一极连接，所述初始化晶体管的第二极与用于输入所述初始化电压的初始化电压线连接。
具体的，所述发光控制电路可以包括发光控制晶体管；
所述发光控制晶体管的控制极与所述发光控制线连接，所述发光控制晶体管的第一极与所述驱动电路的第二端连接，所述发光控制晶体管的第二极与所述发光元件的第一极连接。
具体的，所述补偿控制电路可以包括第一补偿控制晶体管；
所述第一补偿控制晶体管的控制极与所述补偿控制线连接，所述第一补偿控制晶体管的第一极与所述驱动电路的控制端连接，所述第一补偿控制晶体管的第二极与所述驱动电路的第二端连接。
在具体实施时，所述补偿控制电路还可以包括第二补偿控制晶体管；
所述第二补偿控制晶体管的控制极与所述补偿控制线连接，所述第二补偿控制晶体管的第一极与所述参考电压线连接，所述第二补偿控制晶体管的第二极与所述储能电路的第二端连接。
在实际操作时，所述储能电路可以包括存储电容；所述驱动电路可以包括驱动晶体管；所述数据写入电路可以包括数据写入晶体管；
所述存储电容的第一端为所述储能电路的第一端，所述存储电容的第二端为所述储能电路的第二端；
所述驱动晶体管的控制极为所述驱动电路的控制端，所述驱动晶体管的第一极为所述驱动电路的第一端，所述驱动晶体管的第二极为所述驱动电路的第二端；
所述数据写入晶体管的控制极与所述写入控制线连接，所述数据写入晶体管的第一极与数据线连接，所述数据写入晶体管的第二极与所述存储电容的第二端连接；所述数据线用于输入数据电压。
在具体实施时，所述发光元件可以为有机发光二极管；所述发光元件的第一极为所述有机发光二极管的阳极，所述发光元件的第二极为所述有机发光二极管的阴极。
下面通过一具体实施例来说明本公开所述的像素驱动电路。
如图3所示，本公开所述的像素驱动电路的一具体实施例，用于驱动有机发光二极管OLED，所述像素驱动电路的该具体实施例包括驱动电路、发光控制电路、初始化电路、补偿控制电路、储能电路和数据写入电路；
所述初始化电路包括初始化晶体管M5；所述发光控制电路包括发光控制晶体管M6；所述补偿控制电路可以包括第一补偿控制晶体管M2和第二补偿控制晶体管M1；所述储能电路包括存储电容Cst；所述驱动电路包括驱动晶体管M3；所述数据写入电路包括数据写入晶体管M4；
所述有机发光二极管OLED的阴极接入低电压ELVSS；
所述初始化晶体管M5的栅极与补偿控制线Comp(n)连接，所述初始化晶体管M5的源极与所述有机发光二极管OLED的阳极连接，所述初始化晶体管M5的漏极与用于输入所述初始化电压Vint的初始化电压线连接；
所述发光控制晶体管M6的栅极与所述发光控制线EM(n)连接，所述发光控制晶体管M6的漏极与所述驱动晶体管M3的漏极连接，所述发光控制晶体管M6的源极与所述有机发光二极管OLED的阳极连接；
所述驱动晶体管M3的栅极与所述存储电容Cst的第一端连接，所述驱动晶体管M3的源极接入电源电压ELVDD；
所述第一补偿控制晶体管M2的栅极与所述补偿控制线Comp(n)连接，所述第一补偿控制晶体管M2的源极与所述驱动晶体管M3的栅极连接，所述第一补偿控制晶体管M2的漏极与所述驱动晶体管M3的漏极连接；
所述第二补偿控制晶体管M1的栅极与所述补偿控制线Comp(n)连接，所述第二补偿控制晶体管M1的源极与用于输入参考电压Vref的参考电压线连接，所述第二补偿控制晶体管M1的漏极与所述存储电容Cst的第二端连接；
所述数据写入晶体管M4的栅极与所述补偿控制线Comp(n)连接，所述数据写入晶体管M4的漏极接入数据电压Vdata，所述数据写入晶体管M4的源极与所述存储电容Cst的第二端A连接。
在图3所示的具体实施例中，第一电压线为输入ELVDD的电源电压线，第二电压线为输入ELVSS的低电压线，但不以此为限。
在图3所示的具体实施例中，M1和M3为PMOS管(P型金属-氧化物-半导体场效应晶体管)，M2、M4、M5和M6为NMOS管(N型金属-氧化物-半导体场效应晶体管)，但不以此为限。
在图3所示的具体实施例中，节点A为与Cst的第二端连接的节点，节 点B为与Cst的第一端连接的节点，节点C为与OLED的阳极连接的节点，节点D为与M3的源极连接的节点。
在图3所示的具体实施例中，初始化控制线和写入控制线都为补偿控制线Comp(n)，但不以此为限。
如图4所示，本公开如图3所示的像素驱动电路的具体实施例在工作时，
在初始化阶段T1，Comp(n)和EM(n)输入高电平，如图5所示，M1关断，M2、M3、M4、M5和M6打开，Vdata通过打开的M4作用于节点A，Vint通过M5、M6和M2作用于B节点，ELVDD作用于节点D，此时节点A的电压Vdata1(Vdata1为上一行的数据电压)，节点B的电压为Vint，节点C的电位为Vint，节点D的电位为ELVDD，M3处于导通状态，使得不论前一帧画面显示时间的数据电压对应黑或白，M3都由导通状态进行数据写入和阈值补偿，可以改善因磁滞效应产生的短期残像问题；并OLED的阳极接入Vint，以使得OLED不发光，避免残留于OLED的阳极的电荷对发光亮度的影响；
在补偿阶段T2，Comp(n)输入高电平，EM(n)输入低电平，如图6所示，M1和M6关断，M2、M3、M4和M5打开，Vdata写入节点A，写入本行发光所需数据电压，Vint通过M5作用于节点C，使得OLED不发光；ELVDD通过M2和M3作用于节点B，以对Cst充电，从而提升节点B的电位，直至节点B的电位上升为ELVDD+Vth，Vth为M3的阈值电压，此时节点D的电位为ELVDD；
在发光阶段T3，Comp(n)输入低电平，EM(n)输入高电平，如图7所示，M2、M4和M5关断，M1、M3和M6打开，Vref通过M1传递到节点A，即节点A的电压由Vdata变为Vref，节点A的电压的变化量为Vref-Vdata，由于Cst的耦合作用，节点B的电压由ELVDD+Vth变为ELVDD+Vth+Vref-Vdata，此时节点D的电位依然为ELVDD，M3驱动OLED的驱动电流Ioled如下：
Ioled＝K×(Vgs-Vth) 2＝K×(ELVDD+Vth+Vref-Vdata-ELVDD-Vth) 2＝K×(Vdata-Vref) 2；
其中，Vgs为M3的栅源电压，由上式可知，Ioled与ELVDD和Vth无 关。从而，消除由驱动晶体管阈值电压的漂移而产生的短期残像，提高显示效果。
本公开的一些实施例所述的像素驱动方法，应用于上述的像素驱动电路，所述像素驱动方法包括：
在初始化阶段，初始化电路在初始化控制线的控制下，控制将初始化电压写入发光元件的第一极，以使得所述发光元件不发光；补偿控制电路在补偿控制线的控制下，控制所述驱动电路的控制端与所述驱动电路的第二端之间连通，从而将初始化电压写入所述驱动电路的控制端，以使得所述驱动电路在所述控制端的控制下，导通所述驱动电路的第一端与所述驱动电路的第二端之间的连接。
在具体实施时，所述像素驱动电路还可以包括发光控制电路，所述驱动电路的第二端通过所述发光控制电路与所述发光元件的第一极连接；所述像素驱动方法还可以包括：
在所述初始化阶段，所述发光控制电路在发光控制线的控制下，控制所述驱动电路的第二端与所述发光元件的第一极之间连通。
具体的，在所述初始化阶段之后还设置有补偿阶段和发光阶段；所述像素驱动电路还包括储能电路和数据写入电路；所述补偿控制电路还与参考电压线和所述储能电路的第二端连接；所述驱动电路包括驱动晶体管，所述驱动晶体管的控制极为所述驱动电路的控制端，所述驱动晶体管的第一极为所述驱动电路的第一端，所述驱动晶体管的第二极为所述驱动电路的第二端；
所述像素驱动方法还可以包括：
在所述补偿阶段，所述数据写入电路在写入控制线的控制下，将数据电压写入所述储能电路的第二端；所述补偿控制电路在补偿控制线的控制下，控制所述驱动晶体管的控制极与所述驱动晶体管的第二极之间连通，所述驱动晶体管在其控制极的控制下，导通所述驱动晶体管的第一极与所述驱动晶体管的第二极之间的连接，以通过第一电压线输入的第一电压V1向储能电路充电，直至所述驱动晶体管的控制极的电位为V1+Vth，所述驱动晶体管断开其第一极与该驱动晶体管的第二极之间的连接；所述发光控制电路在所述发光控制线的控制下，控制断开所述驱动晶体管的第二极与所述发光元件的 第一极之间的连接；Vth为所述驱动晶体管的阈值电压；
在所述发光阶段，所述补偿控制电路在所述补偿控制线的控制下，将参考电压写入所述储能电路的第二端，以使得所述储能电路的第一端的电位相应改变，所述发光控制电路在发光控制线的控制下，控制所述驱动晶体管的第二极与所述发光元件的第一极之间连通，所述驱动晶体管驱动所述发光元件发光。
具体的，本公开的一些实施例所述的像素驱动方法还可以包括：
在所述补偿阶段，所述初始化电路在所述初始化控制线的控制下，控制将所述初始化电压写入所述发光元件的第一极，以使得所述发光元件不发光；
在所述发光阶段，所述初始化电路在所述初始化控制线的控制下，控制停止将所述初始化电压写入所述发光元件的第一极。
本公开的一些实施例所述的显示装置包括上述的像素驱动电路及像素电路。
本公开的一些实施例所提供的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。
以上所述是本公开的可选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本公开所述原理的前提下，还可以作出若干改进和润饰，这些改进和润饰也应视为本公开的保护范围。

Claims (17)

  1. 一种像素驱动电路，所述像素驱动电路包括驱动电路、初始化电路和补偿控制电路，其中，所述驱动电路的第一端与第一电压线连接；
    所述初始化电路配置为在初始化控制线的控制下，控制将初始化电压写入所述驱动电路的第二端；
    所述补偿控制电路配置为在补偿控制线的控制下，控制所述驱动电路的控制端与所述驱动电路的第二端之间连通，以将初始化电压写入所述驱动电路的控制端。
  2. 如权利要求1所述的像素驱动电路，其中，所述驱动电路的第二端与发光元件的第一极连接，
    所述初始化电路还配置为在初始化控制线的控制下，控制将初始化电压写入所述发光元件的第一极，以使得所述发光元件不发光。
  3. 如权利要求2所述的像素驱动电路，还包括发光控制电路；所述驱动电路的第二端通过所述发光控制电路与所述发光元件的第一极连接；
    所述发光控制电路配置为在发光控制线的控制下，控制所述驱动电路的第二端与所述发光元件的第一极之间连通。
  4. 如权利要求1-3任一项所述的像素驱动电路，还包括储能电路和数据写入电路；所述储能电路的第一端与所述驱动电路的控制端连接；所述储能电路配置为控制所述驱动电路的控制端的电位；
    所述补偿控制电路还与参考电压线和所述储能电路的第二端连接，配置为在所述补偿控制线的控制下，控制将所述参考电压线上的参考电压写入所述储能电路的第二端；
    所述数据写入电路配置为在写入控制线的控制下，将数据电压写入所述储能电路的第二端。
  5. 如权利要求2所述的像素驱动电路，其中，所述初始化电路包括初始化晶体管；
    所述初始化晶体管的控制极与所述初始化控制线连接，所述初始化晶体管的第一极与所述发光元件的第一极连接，所述初始化晶体管的第二极与初 始化电压线连接；所述初始化电压线用于输入所述初始化电压。
  6. 如权利要求3所述的像素驱动电路，其中，所述发光控制电路包括发光控制晶体管；
    所述发光控制晶体管的控制极与所述发光控制线连接，所述发光控制晶体管的第一极与所述驱动电路的第二端连接，所述发光控制晶体管的第二极与所述发光元件的第一极连接。
  7. 如权利要求1至4中任一权利要求所述的像素驱动电路，其中，所述补偿控制电路包括第一补偿控制晶体管；
    所述第一补偿控制晶体管的控制极与所述补偿控制线连接，所述第一补偿控制晶体管的第一极与所述驱动电路的控制端连接，所述第一补偿控制晶体管的第二极与所述驱动电路的第二端连接。
  8. 如权利要求7所述的像素驱动电路，其中，所述像素驱动电路包括储能电路；所述补偿控制电路还包括第二补偿控制晶体管；
    所述第二补偿控制晶体管的控制极与所述补偿控制线连接，所述第二补偿控制晶体管的第一极与参考电压线连接，所述第二补偿控制晶体管的第二极与所述储能电路的第二端连接。
  9. 如权利要求4所述的像素驱动电路，其中，所述储能电路包括存储电容；所述存储电容的第一端为所述储能电路的第一端，所述存储电容的第二端为所述储能电路的第二端。
  10. 如权利要求4所述的像素驱动电路，其中，所述数据写入电路包括数据写入晶体管；
    所述数据写入晶体管的控制极与所述写入控制线连接，所述数据写入晶体管的第一极与数据线连接，所述数据写入晶体管的第二极与所述存储电容的第二端连接；所述数据线用于输入数据电压。
  11. 如权利要求1所述的像素驱动电路，其中，所述驱动电路包括驱动晶体管；
    所述驱动晶体管的控制极为所述驱动电路的控制端，所述驱动晶体管的第一极为所述驱动电路的第一端，所述驱动晶体管的第二极为所述驱动电路的第二端。
  12. 一种像素电路，包括发光元件、存储电容、驱动晶体管、初始化晶体管、发光控制晶体管、第一补偿控制晶体管、第二补偿控制晶体管和数据写入晶体管；
    所述初始化晶体管的控制极与初始化控制线连接，所述初始化晶体管的第一极与所述发光元件的第一极连接，所述初始化晶体管的第二极与初始化电压线连接；所述初始化电压线用于输入初始化电压；
    所述发光控制晶体管的控制极与发光控制线连接，所述发光控制晶体管的第一极与所述驱动晶体管的第二极连接，所述发光控制晶体管的第二极与所述发光元件的第一极连接；所述发光元件的第二极与第二电压线连接；
    所述第一补偿控制晶体管的控制极与补偿控制线连接，所述第一补偿控制晶体管的第一极与所述驱动晶体管的控制极连接，所述第一补偿控制晶体管的第二极与所述驱动晶体管的第二极连接；所述驱动晶体管的第一极与第一电压线连接；
    所述第二补偿控制晶体管的控制极与所述补偿控制线连接，所述第二补偿控制晶体管的第一极与参考电压线连接，所述第二补偿控制晶体管的第二极与所述存储电容的第二端连接；所述存储电容的第一端与所述驱动晶体管的控制极连接；
    所述数据写入晶体管的控制极与写入控制线连接，所述数据写入晶体管的第一极与数据线连接，所述数据写入晶体管的第二极与所述存储电容的第二端连接；所述数据线用于输入数据电压。
  13. 一种像素驱动方法，应用于如权利要求1至11中任一权利要求所述的像素驱动电路或如权利要求12所述的像素电路，所述像素驱动方法包括：
    在初始化阶段，初始化电路在初始化控制线的控制下，控制将初始化电压写入所述驱动电路的第二端；补偿控制电路在补偿控制线的控制下，控制所述驱动电路的控制端与所述驱动电路的第二端之间连通，从而将初始化电压写入所述驱动电路的控制端。
  14. 如权利要求13所述的像素驱动方法，其中，所述像素驱动电路还包括发光控制电路，所述驱动电路的第二端通过所述发光控制电路与所述发光元件的第一极连接；所述像素驱动方法还包括：
    在所述初始化阶段，所述发光控制电路在发光控制线的控制下，控制所述驱动电路的第二端与所述发光元件的第一极之间连通。
  15. 如权利要求14所述的像素驱动方法，其中，在所述初始化阶段之后还设置有补偿阶段和发光阶段；所述像素驱动电路还包括储能电路和数据写入电路；所述补偿控制电路还与参考电压线和所述储能电路的第二端连接；所述驱动电路包括驱动晶体管，所述驱动晶体管的控制极为所述驱动电路的控制端，所述驱动晶体管的第一极为所述驱动电路的第一端，所述驱动晶体管的第二极为所述驱动电路的第二端；
    所述像素驱动方法还包括：
    在所述补偿阶段，所述数据写入电路在写入控制线的控制下，将数据电压写入所述储能电路的第二端；所述补偿控制电路在补偿控制线的控制下，控制所述驱动晶体管的控制极与所述驱动晶体管的第二极之间连通，所述驱动晶体管在其控制极的控制下，导通所述驱动晶体管的第一极与所述驱动晶体管的第二极之间的连接，将第一电压线输入的第一电压V1向储能电路充电，直至所述驱动晶体管的控制极的电位为V1+Vth，所述驱动晶体管断开其第一极与该驱动晶体管的第二极之间的连接；所述发光控制电路在所述发光控制线的控制下，控制断开所述驱动晶体管的第二极与所述发光元件的第一极之间的连接；Vth为所述驱动晶体管的阈值电压；
    在所述发光阶段，所述补偿控制电路在所述补偿控制线的控制下，将参考电压写入所述储能电路的第二端，所述发光控制电路在发光控制线的控制下，控制所述驱动晶体管的第二极与所述发光元件的第一极之间连通，所述驱动晶体管驱动所述发光元件发光。
  16. 如权利要求15所述的像素驱动方法，还包括：
    在所述补偿阶段，所述初始化电路在所述初始化控制线的控制下，控制将所述初始化电压写入所述发光元件的第一极，以使得所述发光元件不发光；
    在所述发光阶段，所述初始化电路在所述初始化控制线的控制下，控制停止将所述初始化电压写入所述发光元件的第一极。
  17. 一种显示装置，包括如权利要求1至11中任一权利要求所述的像素驱动电路或如权利要求12所述的像素电路。
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