WO2023245603A1 - 像素电路、驱动方法和显示装置 - Google Patents

像素电路、驱动方法和显示装置 Download PDF

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Publication number
WO2023245603A1
WO2023245603A1 PCT/CN2022/101046 CN2022101046W WO2023245603A1 WO 2023245603 A1 WO2023245603 A1 WO 2023245603A1 CN 2022101046 W CN2022101046 W CN 2022101046W WO 2023245603 A1 WO2023245603 A1 WO 2023245603A1
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Prior art keywords
control
circuit
light
terminal
electrically connected
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Application number
PCT/CN2022/101046
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English (en)
French (fr)
Inventor
范龙飞
陈小川
卢鹏程
Original Assignee
京东方科技集团股份有限公司
云南创视界光电科技有限公司
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Application filed by 京东方科技集团股份有限公司, 云南创视界光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US18/028,026 priority Critical patent/US20240304153A1/en
Priority to PCT/CN2022/101046 priority patent/WO2023245603A1/zh
Priority to CN202280001914.2A priority patent/CN117651990A/zh
Publication of WO2023245603A1 publication Critical patent/WO2023245603A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—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
    • 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]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3275—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
    • 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
    • G09G2300/0852—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor being a dynamic memory with more than 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
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage

Definitions

  • the present disclosure relates to the field of display technology, and in particular, to a pixel circuit, a driving method and a display device.
  • OLED Organic Light Emitting Diode
  • the relevant pixel circuit includes a driving circuit and a light-emitting element.
  • the driving circuit drives the light-emitting element to emit light according to the data voltage provided by the data line.
  • the associated pixel circuit cannot improve contrast during the non-emitting phase.
  • an embodiment of the present disclosure provides a pixel circuit including a light-emitting element, a data writing circuit, a first control circuit, a driving circuit, a first energy storage circuit and a second energy storage circuit;
  • the first control circuit is electrically connected to the first control terminal, the first pole of the light-emitting element and the first initial voltage terminal respectively, and is used to provide the first control signal at the first control terminal during the non-light-emitting phase. Under the control of the first initial voltage terminal, write the first initial voltage provided by the first initial voltage terminal into the first pole of the light-emitting element;
  • the first end of the first energy storage circuit is electrically connected to the control end of the drive circuit, and the second end of the first energy storage circuit is electrically connected to the first end of the drive circuit.
  • Energy circuits are used to store electrical energy
  • the first end of the second energy storage circuit is electrically connected to the first end of the drive circuit, the second end of the second energy storage circuit is electrically connected to the first voltage end, and the second energy storage circuit is To store electrical energy;
  • the data writing circuit is electrically connected to the writing control terminal, the data line and the control terminal of the driving circuit respectively, and is used to write the data line under the control of the writing control signal provided by the writing control terminal.
  • the provided data voltage is written into the control terminal of the driving circuit;
  • the second end of the driving circuit is electrically connected to the first pole of the light-emitting element, and the driving circuit is used to drive the light-emitting element to emit light under the control of the potential of its control end; the second pole of the light-emitting element is connected to the first pole of the light-emitting element.
  • the two voltage terminals are electrically connected.
  • the pixel circuit further includes a reset circuit; the reset circuit is electrically connected to the reset control terminal, the second initial voltage terminal and the control terminal of the driving circuit, respectively, and is used for Under the control of the reset control signal provided by the reset control terminal, the second initial voltage provided by the second initial voltage terminal is written into the control terminal of the driving circuit.
  • the pixel circuit according to at least one embodiment of the present disclosure further includes a light emission control circuit
  • the light-emitting control circuit is electrically connected to the light-emitting control terminal, the first voltage terminal and the first terminal of the driving circuit respectively, and is used to control the third light-emitting control signal under the control of the light-emitting control signal provided by the light-emitting control terminal.
  • a voltage terminal is connected to the first terminal of the driving circuit.
  • the first control circuit includes a first transistor
  • the control electrode of the first transistor is electrically connected to the first control terminal, the first electrode of the first transistor is electrically connected to the first initial voltage terminal, and the second electrode of the first transistor is electrically connected to the first initial voltage terminal.
  • the first electrode of the light-emitting element is electrically connected.
  • the first transistor is an n-type transistor.
  • the first energy storage circuit includes a first capacitor
  • the second energy storage circuit includes a second capacitor
  • the first end of the first capacitor is electrically connected to the control end of the drive circuit, and the second end of the first capacitor is electrically connected to the first end of the drive circuit;
  • the first terminal of the second capacitor is electrically connected to the first terminal of the driving circuit, and the second terminal of the second capacitor is electrically connected to the first voltage terminal.
  • the data writing circuit includes a second transistor, and the driving circuit includes a driving transistor;
  • the control electrode of the second transistor is electrically connected to the write control terminal, the first electrode of the second transistor is electrically connected to the data line, and the second electrode of the second transistor is electrically connected to the drive circuit.
  • the control end is electrically connected;
  • the control pole of the drive transistor is the control end of the drive circuit
  • the first pole of the drive circuit is the first end of the drive circuit
  • the second pole of the drive circuit is the second end of the drive circuit
  • the reset circuit includes a third transistor
  • the control electrode of the third transistor is electrically connected to the reset control terminal, the first electrode of the third transistor is electrically connected to the second initial voltage terminal, and the second electrode of the third transistor is electrically connected to the drive The control terminal of the circuit is electrically connected.
  • the light emission control circuit includes a fourth transistor
  • the control electrode of the fourth transistor is electrically connected to the light-emitting control terminal, the first electrode of the fourth transistor is electrically connected to the first voltage terminal, and the second electrode of the fourth transistor is electrically connected to the driving circuit. The first end is electrically connected.
  • the first transistor is an n-type transistor, and the fourth transistor is a p-type transistor; the first control terminal is used to provide a first control signal, and the light-emitting control terminal is used to provide a light-emitting control signal;
  • the time for which the potential of the first control signal connected to the control electrode of the first transistor remains at a high voltage is greater than the time for which the potential of the light-emitting control signal connected to the control electrode of the fourth transistor continues to be a high voltage. time.
  • inventions of the present disclosure provide a driving method, which is applied to the above-mentioned pixel circuit.
  • the display cycle includes a non-light-emitting phase and a light-emitting phase that are set in succession.
  • the non-light-emitting phase includes an initialization phase and a light-emitting phase that are set in sequence.
  • Self-discharge stage, data writing stage and light-emitting stage; the driving method includes:
  • the first control circuit writes the first initial voltage provided by the first initial voltage terminal into the first pole of the light-emitting element under the control of the first control signal, and controls the light-emitting element. No light is emitted, and the remaining charge on the first pole of the light-emitting element is cleared and shunted;
  • the data writing circuit writes the data voltage provided by the data line into the control end of the driving circuit under the control of the writing control signal.
  • the pixel circuit also includes a reset circuit; the driving method further includes:
  • the reset circuit writes the second initial voltage provided by the second initial voltage terminal into the control terminal of the driving circuit under the control of the reset control signal, so that when the self-discharge phase begins, the driving circuit can Under the control of the potential of its control terminal, control the connection between the first terminal of the driving circuit and the second terminal of the driving circuit;
  • the drive circuit can control the connection between the first end of the drive circuit and the second end of the drive circuit under the control of the potential of its control end, and change the drive through discharge.
  • the pixel circuit further includes a light emission control circuit
  • the driving method further includes:
  • the light-emitting control circuit controls the connection between the first voltage terminal and the first terminal of the driving circuit under the control of the light-emitting control signal;
  • the light-emitting control circuit controls the disconnection between the first voltage terminal and the first terminal of the driving circuit under the control of the light-emitting control signal;
  • the first control circuit disconnects the first initial voltage terminal from the first pole of the light-emitting element under the control of the first control signal.
  • the light-emitting control circuit controls the first voltage terminal under the control of the light-emitting control signal. It is connected with the first end of the driving circuit, and the driving circuit drives the light-emitting element to emit light.
  • the time for the first control circuit to write the first initial voltage to the first pole of the light-emitting element is greater than the time between the first voltage terminal controlled by the light-emitting control circuit and the first terminal of the driving circuit. Intermittent disconnection time.
  • an embodiment of the present disclosure provides a display device including the above-mentioned pixel circuit.
  • Figure 1 is a structural diagram of a pixel circuit according to an embodiment of the present disclosure
  • Figure 2 is a structural diagram of a pixel circuit according to at least one embodiment of the present disclosure
  • Figure 3 is a structural diagram of a pixel circuit according to at least one embodiment of the present disclosure.
  • Figure 4 is a circuit diagram of a pixel circuit according to at least one embodiment of the present disclosure.
  • FIG. 5 is an operating timing diagram of at least one embodiment of the pixel circuit shown in FIG. 4 of the present disclosure.
  • the transistors used in all embodiments of the present disclosure may be transistors, thin film transistors, field effect transistors, or other devices with the same characteristics.
  • one pole is called the first pole and the other pole is called the second pole.
  • the control electrode when the transistor is a triode, the control electrode may be a base electrode, the first electrode may be a collector, and the second electrode may be an emitter; or, the control electrode may be a base electrode. pole, the first pole may be an emitter, and the second pole may be a collector.
  • the control electrode when the transistor is a thin film transistor or a field effect transistor, the control electrode may be a gate electrode, the first electrode may be a drain electrode, and the second electrode may be a source electrode; or, The control electrode may be a gate electrode, the first electrode may be a source electrode, and the second electrode may be a drain electrode.
  • the pixel circuit includes a light-emitting element E0, a data writing circuit 11, a first control circuit 12, a driving circuit 13, a first energy storage circuit 14 and a second energy storage circuit 15;
  • the first control circuit 12 is electrically connected to the first control terminal S4, the first pole of the light-emitting element E0 and the first initial voltage terminal I1 respectively, and is used to provide power at the first control terminal S4 during the non-light-emitting phase. Under the control of the first control signal, write the first initial voltage provided by the first initial voltage terminal I1 into the first pole of the light-emitting element E0;
  • the first end of the first energy storage circuit 14 is electrically connected to the control end of the drive circuit 13, and the second end of the first energy storage circuit 14 is electrically connected to the first end of the drive circuit 13, so The first energy storage circuit 14 is used to store electrical energy;
  • the first end of the second energy storage circuit 15 is electrically connected to the first end of the driving circuit 13, the second end of the second energy storage circuit 15 is electrically connected to the first voltage terminal V1, and the second end of the second energy storage circuit 15 is electrically connected to the first voltage terminal V1.
  • the energy storage circuit 15 is used to store electrical energy
  • the data writing circuit 11 is electrically connected to the writing control terminal S2, the data line D1 and the control terminal of the driving circuit 13 respectively, and is used for writing under the control of the writing control signal provided by the writing control terminal S2. Write the data voltage provided by the data line D1 into the control terminal of the driving circuit 13;
  • the second end of the drive circuit 13 is electrically connected to the first pole of the light-emitting element E0.
  • the drive circuit 13 is used to drive the light-emitting element E0 to emit light under the control of the potential of its control end;
  • the second pole is electrically connected to the second voltage terminal V2.
  • the first voltage terminal V1 may be a power supply voltage terminal
  • the second voltage terminal V2 may be connected to the common electrode voltage, but is not limited thereto.
  • the first initial voltage terminal may be a ground terminal, but is not limited to this.
  • the first control circuit 12 When at least one embodiment of the pixel circuit of the present disclosure as shown in FIG. 1 is working, in the non-light-emitting phase, the first control circuit 12 writes the first initial voltage into the light-emitting element E0 under the control of the first control signal.
  • the first pole to control the light-emitting element E0 not to emit light;
  • the transistor included in the first control circuit 12 is a shunt device, which divides the current during the non-light-emitting phase to increase the contrast.
  • the non-light-emitting phase may refer to the time period included in the display cycle except the light-emitting phase.
  • the display period may be one frame time, but is not limited to this.
  • the display cycle may include a non-light-emitting phase and a light-emitting phase that are set in succession.
  • the non-light-emitting phase may include an initialization phase, a self-discharge phase, and a self-discharge phase that are set in sequence.
  • the first control circuit 12 writes the first initial voltage provided by the first initial voltage terminal I1 into the first pole of the light-emitting element E0 under the control of the first control signal, To control the light-emitting element E0 not to emit light;
  • the transistor included in the first control circuit 12 is a shunt device, which divides the current and increases the contrast;
  • the data writing circuit 11 writes the data voltage provided by the data line D1 into the control terminal of the driving circuit 13 under the control of the writing control signal.
  • the pixel circuit described in at least one embodiment of the present disclosure also includes a reset circuit 20;
  • the reset circuit 20 is electrically connected to the reset control terminal S3, the second initial voltage terminal I2 (Vofs) and the control terminal of the drive circuit 13, respectively, for controlling the reset control signal provided by the reset control terminal S3. , writing the second initial voltage provided by the second initial voltage terminal I2 into the control terminal of the driving circuit 13 .
  • the reset circuit 20 writes the second initial voltage provided by the second initial voltage terminal I2 under the control of the reset control signal to the driver.
  • the control end of the circuit 13 so that when the self-discharge phase begins, the drive circuit 13 can control the first end of the drive circuit 13 and the third end of the drive circuit 13 under the control of the potential of its control end. The two ends are connected;
  • the drive circuit 13 can control the connection between the first end of the drive circuit 13 and the second end of the drive circuit 13 under the control of the potential of its control end, and the change is caused by discharge.
  • the potential of the first end of the driving circuit 13 is until the driving circuit 13 controls the first end of the driving circuit 13 to be disconnected from the second end of the driving circuit 13 .
  • the pixel circuit described in at least one embodiment of the present disclosure also includes a light emission control circuit 30;
  • the light-emitting control circuit 30 is electrically connected to the light-emitting control terminal S1, the first voltage terminal V1 and the first end of the driving circuit 13, respectively, for controlling the light-emitting control signal provided by the light-emitting control terminal S1. , controlling the connection between the first voltage terminal V1 and the first terminal of the driving circuit 13 .
  • the first control circuit 12 connects the first initial voltage terminal I1 to the first terminal of the light-emitting element E0 under the control of the first control signal.
  • One pole is disconnected, and the light-emitting control circuit 30 controls the connection between the first voltage terminal V1 and the first end of the driving circuit 13 under the control of the light-emitting control signal.
  • the driving circuit 13 drives the light-emitting element E0 to emit light.
  • the first control circuit includes a first transistor
  • the control electrode of the first transistor is electrically connected to the first control terminal, the first electrode of the first transistor is electrically connected to the first initial voltage terminal, and the second electrode of the first transistor is electrically connected to the first initial voltage terminal.
  • the first electrode of the light-emitting element is electrically connected.
  • the first energy storage circuit includes a first capacitor
  • the second energy storage circuit includes a second capacitor
  • the first end of the first capacitor is electrically connected to the control end of the drive circuit, and the second end of the first capacitor is electrically connected to the first end of the drive circuit;
  • the first terminal of the second capacitor is electrically connected to the first terminal of the driving circuit, and the second terminal of the second capacitor is electrically connected to the first voltage terminal.
  • the data writing circuit includes a second transistor, and the driving circuit includes a driving transistor;
  • the control electrode of the second transistor is electrically connected to the write control terminal, the first electrode of the second transistor is electrically connected to the data line, and the second electrode of the second transistor is electrically connected to the drive circuit.
  • the control end is electrically connected;
  • the control pole of the drive transistor is the control end of the drive circuit
  • the first pole of the drive circuit is the first end of the drive circuit
  • the second pole of the drive circuit is the second end of the drive circuit
  • the reset circuit includes a third transistor
  • the control electrode of the third transistor is electrically connected to the reset control terminal, the first electrode of the third transistor is electrically connected to the second initial voltage terminal, and the second electrode of the third transistor is electrically connected to the drive The control terminal of the circuit is electrically connected.
  • the light emission control circuit includes a fourth transistor
  • the control electrode of the fourth transistor is electrically connected to the light-emitting control terminal, the first electrode of the fourth transistor is electrically connected to the first voltage terminal, and the second electrode of the fourth transistor is electrically connected to the driving circuit. The first end is electrically connected.
  • the light-emitting element may be an organic light-emitting diode
  • the first electrode of the light-emitting element may be the anode of the organic light-emitting diode
  • the second electrode of the light-emitting element may be the cathode of the organic light-emitting diode, but this is not the case. is limited.
  • the light-emitting element is an organic light-emitting diode O1;
  • the drive circuit 13 includes a drive transistor M0;
  • the first control circuit 12 includes a first transistor M1;
  • the gate of the first transistor M1 is electrically connected to the first control terminal S4, the source of the first transistor M1 is electrically connected to the ground terminal G1, and the drain of the first transistor M1 is electrically connected to the organic light emitting terminal.
  • the anode of diode O1 is electrically connected;
  • the first energy storage circuit 14 includes a first capacitor C1, and the second energy storage circuit 15 includes a second capacitor C2;
  • the first end of the first capacitor C1 is electrically connected to the gate of the driving transistor M0, and the second end of the first capacitor C1 is electrically connected to the source of the driving transistor M0;
  • the first end of the second capacitor C2 is electrically connected to the source of the driving transistor M0, and the second end of the second capacitor C2 is electrically connected to the power supply voltage terminal ELVDD; the power supply voltage terminal ELVDD is used to provide power VoltageVdd;
  • the data writing circuit 11 includes a second transistor M2;
  • the gate of the second transistor M2 is electrically connected to the write control terminal S2, the source of the second transistor M2 is electrically connected to the data line D1, and the drain of the second transistor M2 is electrically connected to the data line D1.
  • the gate of the driving transistor M0 is electrically connected;
  • the reset circuit 20 includes a third transistor M3;
  • the gate of the third transistor M3 is electrically connected to the reset control terminal S3, the source of the third transistor M3 is electrically connected to the second initial voltage terminal I2, and the drain of the third transistor M3 is electrically connected to the reset control terminal S3.
  • the gate of the driving transistor M0 is electrically connected.
  • the light emission control circuit 30 includes a fourth transistor M4;
  • the gate of the fourth transistor M4 is electrically connected to the light-emitting control terminal S1
  • the source of the fourth transistor M4 is electrically connected to the power supply voltage terminal ELVDD
  • the drain of the fourth transistor M4 is electrically connected to the light-emitting control terminal S1.
  • the source of the driving transistor M0 is electrically connected;
  • the cathode of the organic light-emitting diode O1 is connected to the common electrode voltage Vcom.
  • the first transistor is an n-type transistor, and the fourth transistor is a p-type transistor; the first control terminal is used to provide a first control signal, and the light-emitting control terminal is used to Provide lighting control signals;
  • the time for which the potential of the first control signal connected to the control electrode of the first transistor remains at a high voltage is greater than the time for which the potential of the light-emitting control signal connected to the control electrode of the fourth transistor continues to be a high voltage. time, so that the turn-on time of the first transistor is greater than the turn-off time of the fourth transistor.
  • the first initial voltage terminal I1 is the ground terminal G1 , but it is not limited to this.
  • M0, M2, M3, and M4 are all p-type transistors, and M1 is an n-type transistor, but it is not limited to this.
  • M1 is an n-type transistor to increase the dynamic range of the anode voltage of the organic light-emitting diode O1;
  • M1 is a p-type transistor and the substrate of M1 is connected to a positive voltage, and generally the withstand voltage of M1 is 8V, M1 is easily damaged; for example, if the substrate of M1 is connected to a voltage of 5V, then when the anode of O1 When the voltage is less than -3V, M1 is at risk of damage;
  • M1 is configured as an n-type transistor, and the substrate of M1 is connected to ground or a negative voltage, so the dynamic range of the organic light-emitting diode O1 can be improved.
  • the display cycle includes an initialization phase t1, a self-discharge phase t2, a data writing phase t3 and a light-emitting phase t4 that are set successively;
  • S1 provides a low voltage signal
  • S2 provides a high voltage signal
  • S3 provides a low voltage signal
  • S4 provides a high voltage signal
  • I2 provides the reset voltage Vofs
  • the reset voltage Vofs is low voltage
  • M2 is turned off, M4 is turned on, and M3 Open, M1 is opened to write the low voltage signal provided by I2 into the gate of M0, and write the power supply voltage Vdd into the source of M0
  • the gate-source voltage Vgs of M0 is the initial gate-source voltage Vini
  • Vini is equal to Vdd-Vofs ;O1 does not emit light;
  • S1 provides a high voltage signal
  • S2 provides a high voltage signal
  • S3 provides a high voltage signal
  • S4 provides a high voltage signal
  • M4 is turned off
  • M2 is turned off
  • M3 is turned off
  • M1 is turned on
  • the source of M0 is at floating (floating) state
  • O1 does not emit light
  • Vs Vdd+(
  • Vg Vdd+(
  • S1 provides a high voltage signal
  • S2 provides a low voltage signal
  • S3 provides a high voltage signal
  • S4 provides a high voltage signal.
  • M1 is turned on to control O1 not to emit light; M4 is turned off, M3 is turned off, and M2 is turned on.
  • the data line D1 provides the data voltage Vdata to the gate of M0; the gate voltage of M0 changes from Vofs to Vdata.
  • ⁇ Vs (1-b) ⁇ Vg, where ⁇ Vs is the source of M0
  • ⁇ Vg the change in the gate voltage of M0
  • b is equal to C1z/(C1z+C2z)
  • C1z is the capacitance value of C1
  • C2z is the capacitance value of C2;
  • ⁇ Vg Vdata-Vdd+(Vini-
  • ⁇ Vs (1-b) ⁇ (Vdata-Vdd+(Vini-
  • Vs becomes Vdd-(Vini-
  • Vs becomes Vdata+Vini-b ⁇ Vdata+b ⁇ Vdd-b ⁇ (Vini-
  • S1 provides a low-voltage signal
  • S2 provides a high-voltage signal
  • S3 provides a high-voltage signal
  • S4 provides a low-voltage signal
  • M4 is turned on, M2 and M3 are turned off, M1 is turned off, and M0 drives O1 to emit light; flows through O1
  • the driving current Ioled is as follows:
  • Ioled K(b ⁇ (Vdd-Vdata)-b ⁇ Vini) 2 .
  • M1 is a shunt device, and when O1 does not emit light, the current is branched out. , increase contrast.
  • the driving method described in the embodiment of the present disclosure is applied to the above-mentioned pixel circuit.
  • the display cycle includes a non-light-emitting stage and a light-emitting stage that are set in succession.
  • the non-light-emitting stage includes an initialization stage, a self-discharge stage and a data writing stage that are set in succession.
  • the driving method includes:
  • the first control circuit writes the first initial voltage provided by the first initial voltage terminal into the first pole of the light-emitting element under the control of the first control signal to control light emission.
  • the element does not emit light, and the residual charge on the first pole of the light-emitting element is cleared and shunted;
  • the data writing circuit writes the data voltage provided by the data line into the control end of the driving circuit under the control of the writing control signal.
  • the first control circuit writes the first initial voltage into the first pole of the light-emitting element under the control of the first control signal to control the light-emitting element.
  • the component does not emit light;
  • the transistor included in the first control circuit is a shunt device, which divides the current during the non-light-emitting phase to increase the contrast.
  • the pixel circuit further includes a reset circuit; the driving method further includes:
  • the reset circuit writes the second initial voltage provided by the second initial voltage terminal into the control terminal of the driving circuit under the control of the reset control signal, so that when the self-discharge phase begins, the driving circuit can Under the control of the potential of its control terminal, control the connection between the first terminal of the driving circuit and the second terminal of the driving circuit;
  • the drive circuit can control the connection between the first end of the drive circuit and the second end of the drive circuit under the control of the potential of its control end, and change the drive through discharge.
  • the pixel circuit further includes a light emission control circuit
  • the driving method further includes:
  • the light-emitting control circuit controls the connection between the first voltage terminal and the first terminal of the driving circuit under the control of the light-emitting control signal;
  • the light-emitting control circuit controls the disconnection between the first voltage terminal and the first terminal of the driving circuit under the control of the light-emitting control signal;
  • the first control circuit disconnects the first initial voltage terminal from the first pole of the light-emitting element under the control of the first control signal.
  • the light-emitting control circuit controls the first voltage terminal under the control of the light-emitting control signal. It is connected with the first end of the driving circuit, and the driving circuit drives the light-emitting element to emit light.
  • the time for the first control circuit to write the first initial voltage to the first pole of the light-emitting element is longer than the time for the light-emitting control circuit to control the first voltage terminal and the driving circuit. The time between disconnection of the first end.
  • the display device includes the above-mentioned pixel circuit.
  • the display device provided in the embodiment of the present disclosure can 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, etc.

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Abstract

本公开提供一种像素电路、驱动方法和显示装置。所述像素电路包括发光元件、数据写入电路、第一控制电路、驱动电路、第一储能电路和第二储能电路；第一控制电路用于在非发光阶段，在第一控制端提供的第一控制信号的控制下，将第一初始电压端提供的第一初始电压写入发光元件的第一极；驱动电路在其控制端的电位的控制下，驱动发光元件发光。本公开能够在非发光阶段提升对比度。

Description

像素电路、驱动方法和显示装置 技术领域
本公开涉及显示技术领域，尤其涉及一种像素电路、驱动方法和显示装置。
背景技术
近年来，随着智能显示技术的进步，有机发光显示器(Organic Light Emitting Diode，OLED)成为当今显示器研究领域的热点之一，随着显示面板的减薄化，边框变窄化，以及显示屏低频技术的发展，显示面板优化设计越来越严峻。
相关的像素电路包括驱动电路和发光元件，所述驱动电路根据数据线提供的数据电压，驱动所述发光元件发光。相关的像素电路无法在非发光阶段提升对比度。
发明内容
在一个方面中，本公开实施例提供了一种像素电路，包括发光元件、数据写入电路、第一控制电路、驱动电路、第一储能电路和第二储能电路；
所述第一控制电路分别与第一控制端、所述发光元件的第一极和第一初始电压端电连接，用于在非发光阶段，在所述第一控制端提供的第一控制信号的控制下，将第一初始电压端提供的第一初始电压写入所述发光元件的第一极；
所述第一储能电路的第一端与所述驱动电路的控制端电连接，所述第一储能电路的第二端与所述驱动电路的第一端电连接，所述第一储能电路用于储存电能；
所述第二储能电路的第一端与所述驱动电路的第一端电连接，所述第二储能电路的第二端与第一电压端电连接，所述第二储能电路用于储存电能；
所述数据写入电路分别与写入控制端、数据线和所述驱动电路的控制端电连接，用于在所述写入控制端提供的写入控制信号的控制下，将所述数据 线提供的数据电压写入所述驱动电路的控制端；
所述驱动电路的第二端与所述发光元件的第一极电连接，所述驱动电路用于在其控制端的电位的控制下，驱动发光元件发光；所述发光元件的第二极与第二电压端电连接。
可选的，本公开至少一实施例所述的像素电路还包括复位电路；所述复位电路分别与复位控制端、第二初始电压端和所述驱动电路的控制端电连接，用于在所述复位控制端提供的复位控制信号的控制下，将所述第二初始电压端提供的第二初始电压写入所述驱动电路的控制端。
可选的，本公开至少一实施例所述的像素电路还包括发光控制电路；
所述发光控制电路分别与发光控制端、所述第一电压端和所述驱动电路的第一端电连接，用于在所述发光控制端提供的发光控制信号的控制下，控制所述第一电压端与所述驱动电路的第一端之间连通。
可选的，所述第一控制电路包括第一晶体管；
所述第一晶体管的控制极与所述第一控制端电连接，所述第一晶体管的第一极与所述第一初始电压端电连接，所述第一晶体管的第二极与所述发光元件的第一极电连接。
可选的，所述第一晶体管为n型晶体管。
可选的，所述第一储能电路包括第一电容，所述第二储能电路包括第二电容；
所述第一电容的第一端与所述驱动电路的控制端电连接，所述第一电容的第二端与所述驱动电路的第一端电连接；
所述第二电容的第一端与所述驱动电路的第一端电连接，所述第二电容的第二端与第一电压端电连接。
可选的，所述数据写入电路包括第二晶体管，所述驱动电路包括驱动晶体管；
所述第二晶体管的控制极与所述写入控制端电连接，所述第二晶体管的第一极与所述数据线电连接，所述第二晶体管的第二极与所述驱动电路的控制端电连接；
所述驱动晶体管的控制极为所述驱动电路的控制端，所述驱动电路的第 一极为所述驱动电路的第一端，所述驱动电路的第二极为所述驱动电路的第二端。
可选的，所述复位电路包括第三晶体管；
所述第三晶体管的控制极与所述复位控制端电连接，所述第三晶体管的第一极与所述第二初始电压端电连接，所述第三晶体管的第二极与所述驱动电路的控制端电连接。
可选的，所述发光控制电路包括第四晶体管；
所述第四晶体管的控制极与所述发光控制端电连接，所述第四晶体管的第一极与所述第一电压端电连接，所述第四晶体管的第二极与所述驱动电路的第一端电连接。
可选的，所述第一晶体管为n型晶体管，所述第四晶体管为p型晶体管；所述第一控制端用于提供第一控制信号，所述发光控制端用于提供发光控制信号；
在显示周期内，所述第一晶体管的控制极接入的第一控制信号的电位维持为高电压的时间，大于所述第四晶体管的控制极接入的发光控制信号的电位持续为高电压的时间。
在第二个方面中，本公开实施例提供了一种驱动方法，应用于上述的像素电路，显示周期包括先后设置的非发光阶段和发光阶段，所述非发光阶段包括先后设置的初始化阶段、自放电阶段、数据写入阶段和发光阶段；所述驱动方法包括：
在初始化阶段、自放电阶段和数据写入阶段，第一控制电路在第一控制信号的控制下，将第一初始电压端提供的第一初始电压写入发光元件的第一极，控制发光元件不发光，并清除所述发光元件的第一极残留的电荷，并进行分流；
在数据写入阶段，数据写入电路在写入控制信号的控制下，将数据线提供的数据电压写入驱动电路的控制端。
可选的，所述像素电路还包括复位电路；所述驱动方法还包括：
在初始化阶段，复位电路在复位控制信号的控制下，将第二初始电压端提供的第二初始电压写入驱动电路的控制端，以使得在所述自放电阶段开始 时，所述驱动电路能够在其控制端的电位的控制下，控制所述驱动电路的第一端与所述驱动电路的第二端之间连通；
在自放电阶段开始时，所述驱动电路能够在其控制端的电位的控制下，控制所述驱动电路的第一端与所述驱动电路的第二端之间连通，通过放电而改变所述驱动电路的第一端的电位，直至所述驱动电路控制所述驱动电路的第一端与所述驱动电路的第二端之间断开。
可选的，所述像素电路还包括发光控制电路，所述驱动方法还包括：
在初始化阶段，发光控制电路在发光控制信号的控制下，控制第一电压端与驱动电路的第一端之间连通；
在自放电阶段和数据写入阶段，发光控制电路在发光控制信号的控制下，控制第一电压端与驱动电路的第一端之间断开；
在发光阶段，第一控制电路在第一控制信号的控制下，将第一初始电压端与发光元件的第一极之间断开，发光控制电路在发光控制信号的控制下，控制第一电压端与驱动电路的第一端之间连通，驱动电路驱动发光元件发光。
可选的，在显示周期内，所述第一控制电路将第一初始电压写入发光元件的第一极的时间，大于所述发光控制电路控制第一电压端与驱动电路的第一端之间断开的时间。
在第三个方面中，本公开实施例提供了一种显示装置，包括上述的像素电路。
附图说明
图1是本公开实施例所述的像素电路的结构图；
图2是本公开至少一实施例所述的像素电路的结构图；
图3是本公开至少一实施例所述的像素电路的结构图；
图4是本公开至少一实施例所述的像素电路的电路图；
图5是本公开如图4所示的像素电路的至少一实施例的工作时序图。
具体实施方式
下面将结合本公开实施例中的附图，对本公开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。
如图1所示，本公开实施例所述的像素电路包括发光元件E0、数据写入电路11、第一控制电路12、驱动电路13、第一储能电路14和第二储能电路15；
所述第一控制电路12分别与第一控制端S4、所述发光元件E0的第一极和第一初始电压端I1电连接，用于在非发光阶段，在所述第一控制端S4提供的第一控制信号的控制下，将第一初始电压端I1提供的第一初始电压写入所述发光元件E0的第一极；
所述第一储能电路14的第一端与所述驱动电路13的控制端电连接，所述第一储能电路14的第二端与所述驱动电路13的第一端电连接，所述第一储能电路14用于储存电能；
所述第二储能电路15的第一端与所述驱动电路13的第一端电连接，所述第二储能电路15的第二端与第一电压端V1电连接，所述第二储能电路15用于储存电能；
所述数据写入电路11分别与写入控制端S2、数据线D1和所述驱动电路13的控制端电连接，用于在所述写入控制端S2提供的写入控制信号的控制下，将所述数据线D1提供的数据电压写入所述驱动电路13的控制端；
所述驱动电路13的第二端与所述发光元件E0的第一极电连接，所述驱 动电路13用于在其控制端的电位的控制下，驱动发光元件E0发光；所述发光元件E0的第二极与第二电压端V2电连接。
在本公开至少一实施例中，所述第一电压端V1可以为电源电压端，所述的第二电压端V2可以接入公共电极电压，但不以此为限。
在本公开至少一实施例中，所述第一初始电压端可以为地端，但不以此为限。
本公开如图1所述的像素电路的至少一实施例在工作时，在非发光阶段，第一控制电路12在第一控制信号的控制下，将所述第一初始电压写入发光元件E0的第一极，以控制所述发光元件E0不发光；
所述第一控制电路12包括的晶体管为分流器件，在非发光阶段，将电流分出，增加对比度。
在本公开至少一实施例中，非发光阶段指的可以是显示周期包括的除了发光阶段之外的时间段，所述显示周期可以为一帧时间，但不以此为限。
本公开如图1所述的像素电路的至少一实施例在工作时，显示周期可以包括先后设置的非发光阶段和发光阶段，所述非发光阶段可以包括先后设置的初始化阶段、自放电阶段、数据写入阶段和发光阶段；
在初始化阶段、自放电阶段和数据写入阶段，第一控制电路12在第一控制信号的控制下，将第一初始电压端I1提供的第一初始电压写入发光元件E0的第一极，以控制发光元件E0不发光；所述第一控制电路12包括的晶体管为分流器件，将电流分出，增加对比度；
在数据写入阶段，数据写入电路11在写入控制信号的控制下，将数据线D1提供的数据电压写入驱动电路13的控制端。
如图2所示，在图1所示的像素电路的至少一实施例的基础上，本公开至少一实施例所述的像素电路还包括复位电路20；
所述复位电路20分别与复位控制端S3、第二初始电压端I2(Vofs)和所述驱动电路13的控制端电连接，用于在所述复位控制端S3提供的复位控制信号的控制下，将所述第二初始电压端I2提供的第二初始电压写入所述驱动电路13的控制端。
本公开如图2所示的像素电路的至少一实施例在工作时，在初始化阶段， 复位电路20在复位控制信号的控制下，将第二初始电压端I2提供的第二初始电压写入驱动电路13的控制端，以使得在所述自放电阶段开始时，所述驱动电路13能够在其控制端的电位的控制下，控制所述驱动电路13的第一端与所述驱动电路13的第二端之间连通；
在自放电阶段开始时，所述驱动电路13能够在其控制端的电位的控制下，控制所述驱动电路13的第一端与所述驱动电路13的第二端之间连通，通过放电而改变所述驱动电路13的第一端的电位，直至所述驱动电路13控制所述驱动电路13的第一端与所述驱动电路13的第二端之间断开。
如图3所示，在图2所示的像素电路的至少一实施例的基础上，本公开至少一实施例所述的像素电路还包括发光控制电路30；
所述发光控制电路30分别与发光控制端S1、所述第一电压端V1和所述驱动电路13的第一端电连接，用于在所述发光控制端S1提供的发光控制信号的控制下，控制所述第一电压端V1与所述驱动电路13的第一端之间连通。
本公开如图3所示的像素电路的至少一实施例在工作时，在发光阶段，第一控制电路12在第一控制信号的控制下，将第一初始电压端I1与发光元件E0的第一极之间断开，所述发光控制电路30在发光控制信号的控制下，控制第一电压端V1与驱动电路13的第一端之间连通，所述驱动电路13驱动发光元件E0发光。
可选的，所述第一控制电路包括第一晶体管；
所述第一晶体管的控制极与所述第一控制端电连接，所述第一晶体管的第一极与所述第一初始电压端电连接，所述第一晶体管的第二极与所述发光元件的第一极电连接。
可选的，所述第一储能电路包括第一电容，所述第二储能电路包括第二电容；
所述第一电容的第一端与所述驱动电路的控制端电连接，所述第一电容的第二端与所述驱动电路的第一端电连接；
所述第二电容的第一端与所述驱动电路的第一端电连接，所述第二电容的第二端与第一电压端电连接。
可选的，所述数据写入电路包括第二晶体管，所述驱动电路包括驱动晶 体管；
所述第二晶体管的控制极与所述写入控制端电连接，所述第二晶体管的第一极与所述数据线电连接，所述第二晶体管的第二极与所述驱动电路的控制端电连接；
所述驱动晶体管的控制极为所述驱动电路的控制端，所述驱动电路的第一极为所述驱动电路的第一端，所述驱动电路的第二极为所述驱动电路的第二端。
可选的，所述复位电路包括第三晶体管；
所述第三晶体管的控制极与所述复位控制端电连接，所述第三晶体管的第一极与所述第二初始电压端电连接，所述第三晶体管的第二极与所述驱动电路的控制端电连接。
可选的，所述发光控制电路包括第四晶体管；
所述第四晶体管的控制极与所述发光控制端电连接，所述第四晶体管的第一极与所述第一电压端电连接，所述第四晶体管的第二极与所述驱动电路的第一端电连接。
可选的，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可以为有机发光二极管的阳极，所述发光元件的第二极可以为有机发光二极管的阴极，但不以此为限。
如图4所示，在图3所示的像素电路的至少一实施例的基础上，所述发光元件为有机发光二极管O1；所述驱动电路13包括驱动晶体管M0；
所述第一控制电路12包括第一晶体管M1；
所述第一晶体管M1的栅极与所述第一控制端S4电连接，所述第一晶体管M1的源极与地端G1电连接，所述第一晶体管M1的漏极与所述有机发光二极管O1的阳极电连接；
所述第一储能电路14包括第一电容C1，所述第二储能电路15包括第二电容C2；
所述第一电容C1的第一端与所述驱动晶体管M0的栅极电连接，所述第一电容C1的第二端与所述驱动晶体管M0的源极电连接；
所述第二电容的C2第一端与所述驱动晶体管M0的源极电连接，所述第 二电容C2的第二端与电源电压端ELVDD电连接；所述电源电压端ELVDD用于提供电源电压Vdd；
所述数据写入电路11包括第二晶体管M2；
所述第二晶体管M2的栅极与所述写入控制端S2电连接，所述第二晶体管M2的源极与所述数据线D1电连接，所述第二晶体管M2的漏极与所述驱动晶体管M0的栅极电连接；
所述复位电路20包括第三晶体管M3；
所述第三晶体管M3的栅极与所述复位控制端S3电连接，所述第三晶体管M3的源极与所述第二初始电压端I2电连接，所述第三晶体管M3的漏极与所述驱动晶体管M0的栅极电连接。
所述发光控制电路30包括第四晶体管M4；
所述第四晶体管M4的栅极与所述发光控制端S1电连接，所述第四晶体管M4的源极与所述电源电压端ELVDD电连接，所述第四晶体管M4的漏极与所述驱动晶体管M0的源极电连接；
所述有机发光二极管O1的阴极接入公共电极电压Vcom。
在本公开至少一实施例中，所述第一晶体管为n型晶体管，所述第四晶体管为p型晶体管；所述第一控制端用于提供第一控制信号，所述发光控制端用于提供发光控制信号；
在显示周期内，所述第一晶体管的控制极接入的第一控制信号的电位维持为高电压的时间，大于所述第四晶体管的控制极接入的发光控制信号的电位持续为高电压的时间，以使得第一晶体管的导通时间大于第四晶体管的关断时间。
在图4所示的像素电路的至少一实施例中，所述第一初始电压端I1为地端G1，但不以此为限。
在图4所示的像素电路的至少一实施例中，M0、M2、M3和M4都为p型晶体管，M1为n型晶体管，但不以此为限。
在本公开如图4所示的像素电路的至少一实施例中，M1为n型晶体管，以提升有机发光二极管O1的阳极电压的动态范围；
在具体实施时，如果M1为p型晶体管，M1的衬底接正电压，而一般 M1的耐压为8V，则M1容易损坏；例如，如果M1的衬底接5V电压，则当O1的阳极电压小于-3V时，M1会有损坏的风险；
而本公开至少一实施例将M1设置为n型晶体管，M1的衬底接地或接负电压，因此能够提升有机发光二极管O1的动态范围。
如图5所示，本公开如图4所示的像素电路的至少一实施例在工作时，显示周期包括先后设置的初始化阶段t1、自放电阶段t2、数据写入阶段t3和发光阶段t4；
在初始化阶段t1，S1提供低电压信号，S2提供高电压信号，S3提供低电压信号，S4提供高电压信号，I2提供复位电压Vofs，复位电压Vofs为低电压；M2关断，M4打开，M3打开，M1打开，以将I2提供的低电压信号写入M0的栅极，并将电源电压Vdd写入M0的源极；M0的栅源电压Vgs为初始栅源电压Vini，Vini等于Vdd-Vofs；O1不发光；
在自放电阶段t2，S1提供高电压信号，S2提供高电压信号，S3提供高电压信号，S4提供高电压信号，M4关断，M2关断，M3关断，M1打开，M0的源极处于floating(浮空)状态；由于在初始化阶段t1，M0的栅极写入低电压，M0开始，M0开始自放电操作；O1不发光；
在自放电阶段t2，由于M0的栅极浮空，因此M0的栅极电压随着M0的源极电压同时下降，C1维持M0的栅源电压Vgs为Vini；
由于背栅效应，|V TH_EF|＝a×(Vdd-Vs)+|Vth|；其中，a为背栅效应的系数，Vs为M0的源极电压；
随着Vs的下降，此时Vgs仍保持为Vini，当|V TH_EF|增加到Vini时停止放电，此时，a×(Vdd-Vs)+|Vth|＝Vini；
Vs＝Vdd+(|Vth|-Vini)/a；Vg＝Vdd+(|Vth|-Vini)/a-Vini；其中，Vg为M0的栅极电压；
在数据写入阶段t3，S1提供高电压信号，S2提供低电压信号，S3提供高电压信号，S4提供高电压信号，M1打开，以控制O1不发光；M4关断，M3关断，M2打开，数据线D1提供数据电压Vdata至M0的栅极；M0的栅极电压由Vofs变化为Vdata，由于M0的源极浮空，ΔVs＝(1-b)ΔVg，其中，ΔVs为M0的源极电压的变化量，ΔVg为M0的栅极电压的变化量；b等于 C1z/(C1z+C2z)，C1z为C1的电容值，C2z为C2的电容值；
ΔVg＝Vdata-Vdd+(Vini-|Vth|)/a+Vini；
ΔVs＝(1-b)×(Vdata-Vdd+(Vini-|Vth|)/a+Vini)；
Vs变为Vdd-(Vini-|Vth|)/a+(1-b)×(Vdata-Vdd+(Vini-|Vth|)/a+Vini)；
也即Vs变为Vdata+Vini-b×Vdata+b×Vdd-b×(Vini-|Vth|)/a-b×Vini；
|Vgs|＝(1-b/a-b)×Vini+b×|Vth|/a+b×(Vdd-Vdata)；
在发光阶段t4，S1提供低电压信号，S2提供高电压信号，S3提供高电压信号，S4提供低电压信号，M4打开，M2和M3关断，M1关断，M0驱动O1发光；流过O1的驱动电流Ioled如下：
Ioled＝K((1-b/a-b)×Vini+b×(Vdd-Vdata)+(b/a-1)×|Vth|) 2；
从上式可以看出，当b/a等于1时，Ioled与Vth无关，此时，
Ioled＝K(b×(Vdd-Vdata)-b×Vini) 2。
本公开如图4所示的像素电路的至少一实施例在工作时，在初始化阶段t1、自放电阶段t2和数据写入阶段t3，M1为分流器件，在O1未发光时，将电流分出，增加对比度。
本公开实施例所述的驱动方法，应用于上述的像素电路，显示周期包括先后设置的非发光阶段和发光阶段，所述非发光阶段包括先后设置的初始化阶段、自放电阶段和数据写入阶段；所述驱动方法包括：
在初始化阶段、自放电阶段和数据写入阶段，第一控制电路在第一控制信号的控制下，将第一初始电压端提供的第一初始电压写入发光元件的第一极，以控制发光元件不发光，并清除所述发光元件的第一极残留的电荷，并进行分流；
在数据写入阶段，数据写入电路在写入控制信号的控制下，将数据线提供的数据电压写入驱动电路的控制端。
在本公开实施例所述的驱动方法，在非发光阶段，第一控制电路在第一控制信号的控制下，将所述第一初始电压写入发光元件的第一极，以控制所述发光元件不发光；
所述第一控制电路包括的晶体管为分流器件，在非发光阶段，将电流分出，增加对比度。
在本公开至少一实施例中，所述像素电路还包括复位电路；所述驱动方法还包括：
在初始化阶段，复位电路在复位控制信号的控制下，将第二初始电压端提供的第二初始电压写入驱动电路的控制端，以使得在所述自放电阶段开始时，所述驱动电路能够在其控制端的电位的控制下，控制所述驱动电路的第一端与所述驱动电路的第二端之间连通；
在自放电阶段开始时，所述驱动电路能够在其控制端的电位的控制下，控制所述驱动电路的第一端与所述驱动电路的第二端之间连通，通过放电而改变所述驱动电路的第一端的电位，直至所述驱动电路控制所述驱动电路的第一端与所述驱动电路的第二端之间断开。
在本公开至少一实施例中，所述像素电路还包括发光控制电路，所述驱动方法还包括：
在初始化阶段，发光控制电路在发光控制信号的控制下，控制第一电压端与驱动电路的第一端之间连通；
在自放电阶段和数据写入阶段，发光控制电路在发光控制信号的控制下，控制第一电压端与驱动电路的第一端之间断开；
在发光阶段，第一控制电路在第一控制信号的控制下，将第一初始电压端与发光元件的第一极之间断开，发光控制电路在发光控制信号的控制下，控制第一电压端与驱动电路的第一端之间连通，驱动电路驱动发光元件发光。
在本公开至少一实施例中，在显示周期内，所述第一控制电路将第一初始电压写入发光元件的第一极的时间，大于所述发光控制电路控制第一电压端与驱动电路的第一端之间断开的时间。
本公开实施例所述的显示装置包括上述的像素电路。
本公开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优选实施方式，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 (15)

  1. 一种像素电路，包括发光元件、数据写入电路、第一控制电路、驱动电路、第一储能电路和第二储能电路；
    所述第一控制电路分别与第一控制端、所述发光元件的第一极和第一初始电压端电连接，用于在非发光阶段，在所述第一控制端提供的第一控制信号的控制下，将第一初始电压端提供的第一初始电压写入所述发光元件的第一极；
    所述第一储能电路的第一端与所述驱动电路的控制端电连接，所述第一储能电路的第二端与所述驱动电路的第一端电连接，所述第一储能电路用于储存电能；
    所述第二储能电路的第一端与所述驱动电路的第一端电连接，所述第二储能电路的第二端与第一电压端电连接，所述第二储能电路用于储存电能；
    所述数据写入电路分别与写入控制端、数据线和所述驱动电路的控制端电连接，用于在所述写入控制端提供的写入控制信号的控制下，将所述数据线提供的数据电压写入所述驱动电路的控制端；
    所述驱动电路的第二端与所述发光元件的第一极电连接，所述驱动电路用于在其控制端的电位的控制下，驱动发光元件发光；所述发光元件的第二极与第二电压端电连接。
  2. 如权利要求1所述的像素电路，其中，还包括复位电路；所述复位电路分别与复位控制端、第二初始电压端和所述驱动电路的控制端电连接，用于在所述复位控制端提供的复位控制信号的控制下，将所述第二初始电压端提供的第二初始电压写入所述驱动电路的控制端。
  3. 如权利要求2所述的像素电路，其中，还包括发光控制电路；
    所述发光控制电路分别与发光控制端、所述第一电压端和所述驱动电路的第一端电连接，用于在所述发光控制端提供的发光控制信号的控制下，控制所述第一电压端与所述驱动电路的第一端之间连通。
  4. 如权利要求3所述的像素电路，其中，所述第一控制电路包括第一晶体管；
    所述第一晶体管的控制极与所述第一控制端电连接，所述第一晶体管的第一极与所述第一初始电压端电连接，所述第一晶体管的第二极与所述发光元件的第一极电连接。
  5. 如权利要求4所述的像素电路，其中，所述第一晶体管为n型晶体管。
  6. 如权利要求1所述的像素电路，其中，所述第一储能电路包括第一电容，所述第二储能电路包括第二电容；
    所述第一电容的第一端与所述驱动电路的控制端电连接，所述第一电容的第二端与所述驱动电路的第一端电连接；
    所述第二电容的第一端与所述驱动电路的第一端电连接，所述第二电容的第二端与第一电压端电连接。
  7. 如权利要求1所述的像素电路，其中，所述数据写入电路包括第二晶体管，所述驱动电路包括驱动晶体管；
    所述第二晶体管的控制极与所述写入控制端电连接，所述第二晶体管的第一极与所述数据线电连接，所述第二晶体管的第二极与所述驱动电路的控制端电连接；
    所述驱动晶体管的控制极为所述驱动电路的控制端，所述驱动电路的第一极为所述驱动电路的第一端，所述驱动电路的第二极为所述驱动电路的第二端。
  8. 如权利要求2所述的像素电路，其中，所述复位电路包括第三晶体管；
    所述第三晶体管的控制极与所述复位控制端电连接，所述第三晶体管的第一极与所述第二初始电压端电连接，所述第三晶体管的第二极与所述驱动电路的控制端电连接。
  9. 如权利要求4所述的像素电路，其中，所述发光控制电路包括第四晶体管；
    所述第四晶体管的控制极与所述发光控制端电连接，所述第四晶体管的第一极与所述第一电压端电连接，所述第四晶体管的第二极与所述驱动电路的第一端电连接。
  10. 如权利要求9所述的像素电路，其中，所述第一晶体管为n型晶体管，所述第四晶体管为p型晶体管；所述第一控制端用于提供第一控制信号， 所述发光控制端用于提供发光控制信号；
    在显示周期内，所述第一晶体管的控制极接入的第一控制信号的电位维持为高电压的时间，大于所述第四晶体管的控制极接入的发光控制信号的电位持续为高电压的时间。
  11. 一种驱动方法，应用于如权利要求1至10中任一权利要求所述的像素电路，显示周期包括先后设置的非发光阶段和发光阶段，所述非发光阶段包括先后设置的初始化阶段、自放电阶段、数据写入阶段和发光阶段；所述驱动方法包括：
    在初始化阶段、自放电阶段和数据写入阶段，第一控制电路在第一控制信号的控制下，将第一初始电压端提供的第一初始电压写入发光元件的第一极，控制发光元件不发光，并清除所述发光元件的第一极残留的电荷，并进行分流；
    在数据写入阶段，数据写入电路在写入控制信号的控制下，将数据线提供的数据电压写入驱动电路的控制端。
  12. 如权利要求11所述的驱动方法，其中，所述像素电路还包括复位电路；所述驱动方法还包括：
    在初始化阶段，复位电路在复位控制信号的控制下，将第二初始电压端提供的第二初始电压写入驱动电路的控制端，以使得在所述自放电阶段开始时，所述驱动电路能够在其控制端的电位的控制下，控制所述驱动电路的第一端与所述驱动电路的第二端之间连通；
    在自放电阶段开始时，所述驱动电路能够在其控制端的电位的控制下，控制所述驱动电路的第一端与所述驱动电路的第二端之间连通，通过放电而改变所述驱动电路的第一端的电位，直至所述驱动电路控制所述驱动电路的第一端与所述驱动电路的第二端之间断开。
  13. 如权利要求12所述的驱动方法，其中，所述像素电路还包括发光控制电路，所述驱动方法还包括：
    在初始化阶段，发光控制电路在发光控制信号的控制下，控制第一电压端与驱动电路的第一端之间连通；
    在自放电阶段和数据写入阶段，发光控制电路在发光控制信号的控制下， 控制第一电压端与驱动电路的第一端之间断开；
    在发光阶段，第一控制电路在第一控制信号的控制下，将第一初始电压端与发光元件的第一极之间断开，发光控制电路在发光控制信号的控制下，控制第一电压端与驱动电路的第一端之间连通，驱动电路驱动发光元件发光。
  14. 如权利要求13所述的驱动方法，其中，在显示周期内，所述第一控制电路将第一初始电压写入发光元件的第一极的时间，大于所述发光控制电路控制第一电压端与驱动电路的第一端之间断开的时间。
  15. 一种显示装置，包括如权利要求1至10中任一权利要求所述的像素电路。
PCT/CN2022/101046 2022-06-24 2022-06-24 像素电路、驱动方法和显示装置 WO2023245603A1 (zh)

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