WO2016107026A1 - 像素驱动电路、方法和显示装置 - Google Patents

像素驱动电路、方法和显示装置 Download PDF

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Publication number
WO2016107026A1
WO2016107026A1 PCT/CN2015/077511 CN2015077511W WO2016107026A1 WO 2016107026 A1 WO2016107026 A1 WO 2016107026A1 CN 2015077511 W CN2015077511 W CN 2015077511W WO 2016107026 A1 WO2016107026 A1 WO 2016107026A1
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Prior art keywords
transistor
driving transistor
control
storage capacitor
gate
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PCT/CN2015/077511
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English (en)
French (fr)
Inventor
周茂秀
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京东方科技集团股份有限公司
合肥鑫晟光电科技有限公司
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Priority to US14/892,170 priority Critical patent/US9898965B2/en
Publication of WO2016107026A1 publication Critical patent/WO2016107026A1/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
    • G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
    • G—PHYSICS
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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]
    • 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]
    • 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]
    • G09G3/3266—Details of drivers for scan electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • 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
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0421—Structural details of the set of electrodes
    • G09G2300/043—Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • G—PHYSICS
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    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
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    • 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
    • G09G2310/0262—The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to a pixel driving circuit, method, and display device.
  • the threshold voltage Vth of a TFT (Thin Film Transistor) on an AMOLED (Active Matrix/Organic Light Emitting Diode) is shifted, resulting in different pixel currents.
  • the existing pixel driving circuit with threshold compensation function mostly charges the storage capacitor through the voltage Vdata of the data signal on the data line in the pre-charging phase, and reaches the threshold compensation by discharging the storage capacitor in the compensation phase, and then drives in the light-emitting phase.
  • OLED Organic Light Emitting Diode
  • a main object of the present disclosure is to provide a pixel driving circuit, a method, and a display device, which solve the problem of using a plurality of transistors in the prior art to compensate for a threshold voltage of a driving transistor to make a pixel pitch small.
  • the present disclosure provides a pixel driving circuit including a precharge control unit, a storage capacitor, a driving transistor, and a threshold compensation unit, wherein
  • the driving transistor has a gate connected to the data line through the precharge control unit, a first pole connected to the light emitting component, and a second pole connected to the first end of the storage capacitor;
  • the pre-charging control unit is respectively connected to the first scan signal, the second scan signal and the power supply voltage Vdd, respectively connected to the first end of the storage capacitor, the gate of the driving transistor and the data line, and
  • the threshold compensation unit is connected to the second end of the storage capacitor;
  • the threshold compensation unit, the access control signal is respectively connected to the gate and the gate of the driving transistor a first pole of the driving transistor, a second end of the storage capacitor and a ground terminal for conducting the gate of the driving transistor and the storage capacitor under the control of the control signal in a pre-charging phase Second end connection;
  • the precharge control unit is configured to charge the storage capacitor by the power voltage Vdd under a control of the first scan signal and the second scan signal in a precharge phase, so that the first of the storage capacitors
  • the potential of the terminal is Vdd; in the threshold compensation phase, controlling the gate of the driving transistor to access the data signal output by the data line in the threshold compensation phase under the control of the second scanning signal; Controlling the second pole of the driving transistor to control the power supply voltage Vdd under the control of the first scan signal;
  • the threshold compensation unit is further configured to, in the threshold compensation phase, control the storage capacitor discharge together with the driving transistor under the control of the control signal until the potential of the second pole of the driving transistor is Vdata+Vth; Also used in the light emitting phase to turn on the connection of the gate of the driving transistor and the second end of the storage capacitor, thereby controlling the gate-source voltage compensation Vth of the driving transistor; wherein Vth is the threshold voltage of the driving transistor, Vdata is the voltage of the data signal.
  • the pre-charge control unit includes:
  • a first pre-charging transistor the gate is connected to the first scan signal, a first pole is connected to the first end of the storage capacitor, and a second pole is connected to the power supply voltage;
  • a second pre-charging transistor the gate is connected to the second scan signal, the first pole is connected to the data line, and the second pole is connected to the gate of the driving transistor.
  • the threshold compensation unit includes:
  • a first compensation transistor the gate is connected to the control signal, a first pole is connected to the second end of the storage capacitor, and a second pole is connected to a gate of the driving transistor;
  • a second compensation transistor the gate is connected to the control signal, the first pole is grounded, and the second pole is connected to the first pole of the driving transistor.
  • the first pre-charge transistor, the second pre-charge transistor, the second compensation transistor, and the driving transistor are all NMOS transistors, and the first compensation transistor is a PMOS transistor.
  • the first pre-charge transistor, the second pre-charge transistor, the second compensation transistor, and the driving transistor are all PMOS transistors, and the first compensation transistor is an NMOS transistor. tube.
  • the present disclosure also provides a pixel driving method, which is applied to the above pixel driving circuit, and the pixel driving method includes:
  • the data line outputs a zero level
  • the threshold compensation unit turns on the connection of the gate of the driving transistor and the second end of the storage capacitor under the control of the control signal
  • the pre-charging control unit is in the first scanning signal and the second scanning
  • the storage capacitor is charged by the power supply voltage Vdd under the control of the signal, so that the potential of the first end of the storage capacitor is Vdd;
  • the data line outputs a data signal
  • the driving transistor is turned on, and the precharge control unit controls the gate of the driving transistor to access the data signal under the control of the second scanning signal, and the threshold compensation unit is under the control of the control signal.
  • the precharge control unit controls the second pole of the driving transistor to be connected to the power voltage Vdd under the control of the first scan signal, and the threshold compensation unit turns on the connection between the gate of the driving transistor and the second end of the storage capacitor.
  • the driving transistor is caused to drive the light emitting element to emit light, and the gate-source voltage of the driving transistor is controlled to compensate Vth.
  • the present disclosure also provides a pixel driving method, which is applied to the above pixel driving circuit, and the pixel driving method includes:
  • the data line outputs a zero level.
  • the first threshold compensation transistor is turned on.
  • the first pre-charge transistor and the second pre-control The charging transistor is turned on, and the storage capacitor is charged by the power supply voltage;
  • the first scan signal controls the first pre-charge transistor to be turned off, the second scan signal continues to control the second pre-charge transistor to be turned on; and the data line outputs a data signal to control the drive transistor Turning on, the control signal controls the second compensation transistor to be turned on, and the storage capacitor discharges to the ground through the driving transistor and the second compensation transistor until the potential of the second pole of the driving transistor is Vdata+Vth; Vth is a threshold voltage of the driving transistor, and Vdata is a voltage of the data signal;
  • the first scan signal controls the first pre-charging transistor to be turned on, so that the second pole of the driving transistor is connected to the power supply voltage Vdd, and the control signal controls the first compensation transistor to be turned on.
  • the second compensation transistor is turned off to turn on the connection of the gate of the driving transistor and the second end of the storage capacitor, so that the driving transistor is turned on to drive the light emitting element to emit light, and the gate-source voltage of the driving transistor is controlled to compensate Vth.
  • the present disclosure also provides a display device including the above-described pixel driving circuit.
  • the pixel driving circuit, the method and the display device of the present disclosure can directly control the driving transistor by using a data signal when compensating the threshold voltage of the driving transistor, thereby saving the number of transistors and thereby reducing the circuit. Design space to increase pixel pitch.
  • FIG. 1 is a circuit diagram of a pixel driving circuit according to an embodiment of the present disclosure
  • FIG. 2 is a circuit diagram of a pixel driving circuit according to another embodiment of the present disclosure.
  • FIG. 3 is a signal timing diagram of a pixel driving circuit according to an embodiment of the present disclosure.
  • 4A is a schematic diagram of the operation of the pixel driving circuit in the pre-charging stage S1 according to an embodiment of the present disclosure
  • FIG. 4B is a schematic diagram of the operation of the pixel driving circuit in the threshold compensation phase S2 according to an embodiment of the present disclosure
  • 4C is a schematic diagram of the operation of the pixel driving circuit in the light emitting stage S3 according to an embodiment of the present disclosure
  • FIG. 5 is a signal timing diagram of a pixel driving circuit according to still another embodiment of the present disclosure.
  • the transistors employed in all embodiments of the present disclosure may each be a thin film transistor or a field effect transistor or other device having the same characteristics.
  • the two poles except the gate of the transistor are referred to as a first pole and a second pole, respectively.
  • the pixel driving circuit of the embodiment of the present disclosure includes a precharge control unit 11 , a storage capacitor Cs, a driving transistor DTFT, and a threshold compensation unit 12, where
  • the driving transistor DTFT passes through the precharge control unit 11 and the data line Data Connected, the first pole is connected to the anode of the light-emitting element D1, the second pole is connected to the first end A of the storage capacitor Cs; the cathode of the light-emitting element D1 is connected to the ground GND;
  • the pre-charge control unit 11 respectively accesses the first scan signal Scan1, the second scan signal Scan2, and the power supply voltage Vdd, and also the first end A of the storage capacitor Cs, the gate and the data of the drive transistor, respectively.
  • the line Data is connected and connected to the second end B of the storage capacitor Cs through the threshold compensation unit.
  • the threshold compensation unit 12 is connected to the gate of the driving transistor DTFT, the first pole of the driving transistor DTFT, the second terminal B of the storage capacitor Cs, and the ground GND, respectively. For connecting the gate of the driving transistor DTFT and the second end B of the storage capacitor Cs under the control of the control signal EN in a pre-charging phase;
  • the precharge control unit is configured to charge the storage capacitor Cs by the power voltage Vdd under the control of the first scan signal Scan1 and the second scan signal Scan2 in a precharge phase, so that the The potential of the first end of the storage capacitor Cs is Vdd; in the threshold compensation phase, controlling the gate of the driving transistor DTFT to access the data line Data during the threshold compensation phase under the control of the second scan signal Scan2 a data signal; in the light emitting phase, controlling the second pole of the driving transistor DTFT to access the power voltage Vdd under the control of the first scan signal Scan1.
  • the threshold compensation unit 12 is configured to control, during the threshold compensation phase, the storage capacitor Cs to be discharged together with the driving transistor DTFT under the control of the control signal EN until the potential of the second pole of the driving transistor DTFT is Vdata+Vth; is further configured to, in the light emitting phase, turn on a connection between a gate of the driving transistor DTFT and a second end B of the storage capacitor Cs, thereby controlling a gate-source voltage compensation Vth of the driving transistor DTFT; Vdata is the voltage of the data signal, and Vth is the threshold voltage of the driving transistor DTFT.
  • the pixel driving circuit of the embodiment of the present disclosure directly controls the driving transistor DTFT by using the data signal on the data line Data, and can save the threshold voltage of the driving transistor while saving the number of transistors, thereby reducing the space occupied by the circuit and increasing the pixel. spacing.
  • the pre-charge control unit may include:
  • a first pre-charging transistor the gate is connected to the first scan signal, a first pole is connected to the first end of the storage capacitor, and a second pole is connected to the power supply voltage;
  • a second pre-charging transistor the gate is connected to the second scan signal, the first pole is connected to the data line, and the second pole is connected to the gate of the driving transistor.
  • the threshold compensation unit may include:
  • a first compensation transistor the gate is connected to the control signal, a first pole is connected to the second end of the storage capacitor, and a second pole is connected to a gate of the driving transistor;
  • a second compensation transistor the gate is connected to the control signal, the first pole is grounded, and the second pole is connected to the first pole of the driving transistor.
  • the light emitting element is a light emitting diode OLED.
  • the pre-charge control unit includes:
  • the first pre-charging transistor T11 the gate is connected to the first scan signal Scan1, the first pole is connected to the first end A of the storage capacitor Cs, and the second pole is connected to the power supply voltage Vdd;
  • a second pre-charge transistor T12 the gate is connected to the second scan signal Scan2, the first pole is connected to the data line Data, and the second pole is connected to the gate of the driving transistor DTFT.
  • the threshold compensation unit includes:
  • a first compensation transistor T21 the gate is connected to the control signal EN, a first pole is connected to the second end B of the storage capacitor Cs, and a second pole is connected to a gate of the driving transistor DTFT;
  • a second compensation transistor T22 the gate is connected to the control signal EN, the first pole is connected to the ground GND, and the second pole is connected to the first pole of the driving transistor DTFT;
  • the driving transistor DTFT the gate is connected to the data line Data via the second pre-charging transistor T12, the first pole is connected to the anode of the light-emitting diode OLED, and the second pole is connected to the first pole of the first pre-charging transistor T11;
  • the cathode of the light emitting diode OLED is connected to the ground GND.
  • the first pre-charge transistor, the second pre-charge transistor, the second compensation transistor, and the driving transistor are all NMOS (N-Mental-Oxide) a -Semiconductor, N-type metal-oxide-semiconductor tube, the first compensation transistor being a PMOS (P-Mental-Oxide-Semiconductor, P-type metal-oxide-semiconductor) tube.
  • the first compensation transistor and the second compensation transistor are set to opposite types MOS tube, which can reduce the number of control signals and facilitate circuit design.
  • the embodiment of the pixel driving circuit shown in FIG. 2 adopts a 5T1C structure to realize the compensation of the threshold voltage of the driving transistor, and the data signal directly controls the driving transistor, thereby saving the transistor and reducing one transistor compared to the 6T1C structure.
  • using a control signal can control two compensation transistors of opposite types, reducing the number of control signals, thereby saving space occupied by circuits and increasing pixel pitch.
  • the pixel driving circuit as shown in FIG. 2 is in operation:
  • the first scan signal Scan1 and the second scan signal Scan2 are both at a high level, the data line Data outputs a zero level, the control signal EN is at a low level, and the first precharge transistor T11 and the second pre-charging transistor T12 are both turned on, the first compensating transistor T21 is turned on, and the storage capacitor Cs is charged by the power supply voltage Vdd;
  • the first scan signal Scan1 jumps to a low level
  • the second scan signal Scan2 remains at a high level
  • the control signal EN jumps to a high level
  • the first pre- The charging transistor T11 is turned off, and the second pre-charging transistor T12 continues to be turned on.
  • the data line Data outputs a data signal to control the driving transistor DTFT to be turned on, the second compensation transistor T22 is turned on, and the storage capacitor Cs passes through The driving transistor DTFT and the second compensation transistor T22 are discharged to the ground GND until the potential of the second electrode of the driving transistor DTFT, that is, the potential of the point A is Vdata+Vth; Vth is the threshold voltage of the driving transistor DTFT, and Vdata is The voltage of the data signal on the data line Data;
  • the first scan signal Scan1 jumps to a high level
  • the second scan signal Scan2 jumps to a low level
  • the first precharge transistor T11 is turned on
  • the second The pre-charging transistor T12 is turned off, so that the second pole of the driving transistor DTFT is connected to the power supply voltage Vdd
  • the control signal EN is jumped to a low level
  • the control signal EN controls the first compensation transistor T21 to be turned on.
  • the second compensation transistor T22 is turned off to turn on the connection between the gate of the driving transistor DTFT and the second end B of the storage capacitor.
  • the gate-source voltage of the driving transistor DTFT compensates for Vth.
  • transistors framed by dashed lines are conductive.
  • the DTFTs can also all be PMOS transistors, and the first compensation transistor T21 can be an NMOS transistor.
  • the first scan signal Scan1, the second scan signal Scan2, the data signal on the data line Data, and the control signal EN in FIG. 3 it is only necessary to set the first scan signal Scan1, the second scan signal Scan2, the data signal on the data line Data, and the control signal EN in FIG. 3 to be inverted. Variations of the above transistor types and variations in the timing of the respective signals are well known to those skilled in the art and will not be described herein.
  • the embodiment of the present disclosure further provides a pixel driving method, which is applied to the above pixel driving circuit, and includes:
  • the data line outputs a zero level
  • the threshold compensation unit turns on the connection of the gate of the driving transistor and the second end of the storage capacitor under the control of the control signal
  • the pre-charging control unit is in the first scanning signal and the second scanning
  • the storage capacitor is charged by the power supply voltage Vdd under the control of the signal, so that the potential of the first end of the storage capacitor is Vdd;
  • the data line outputs a data signal
  • the driving transistor is turned on, and the precharge control unit controls the gate of the driving transistor to access the data signal under the control of the second scanning signal, and the threshold compensation unit is under the control of the control signal.
  • the precharge control unit controls the second pole of the driving transistor to be connected to the power voltage Vdd under the control of the first scan signal, and the threshold compensation unit turns on the connection between the gate of the driving transistor and the second end of the storage capacitor.
  • the driving transistor is caused to drive the light emitting element to emit light, and the gate-source voltage of the driving transistor is controlled to compensate Vth.
  • the embodiment of the present disclosure further provides a pixel driving method, which is applied to the above pixel driving circuit, and includes:
  • the data line outputs a zero level.
  • the first threshold compensation transistor is turned on.
  • the first pre-charge transistor and the second pre-control The charging transistor is turned on, and the storage capacitor is charged by the power supply voltage;
  • the first scan signal controls the first pre-charge transistor to be turned off, the second scan signal continues to control the second pre-charge transistor to be turned on; and the data line outputs a data signal to control the drive transistor Turning on, the control signal controls the second compensation transistor to be turned on, and the storage capacitor discharges to the ground through the driving transistor and the second compensation transistor until the potential of the second pole of the driving transistor is Vdata+Vth; Vth is a threshold voltage of the driving transistor, and Vdata is a voltage of the data signal;
  • the first scan signal controls the first pre-charging transistor to be turned on, such that the second pole of the driving transistor is connected to the power supply voltage Vdd, and the control signal controls the first compensation transistor to be turned on and the second compensation transistor to be turned off,
  • the connection of the gate of the driving transistor to the second end of the storage capacitor is turned on, so that the driving transistor is turned on to drive the light emitting element to emit light, and the gate-source voltage of the driving transistor is controlled to compensate Vth.
  • the display device includes the pixel driving circuit described above.
  • the display device may be a display device such as a liquid crystal display, a liquid crystal television, an OLED (Organic Light-Emitting Diode) display panel, an OLED display, an OLED television, or an electronic paper.
  • a display device such as a liquid crystal display, a liquid crystal television, an OLED (Organic Light-Emitting Diode) display panel, an OLED display, an OLED television, or an electronic paper.
  • a display device such as a liquid crystal display, a liquid crystal television, an OLED (Organic Light-Emitting Diode) display panel, an OLED display, an OLED television, or an electronic paper.
  • OLED Organic Light-Emitting Diode

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Abstract

一种像素驱动电路、方法和显示装置。像素驱动电路包括预充电控制单元（11）、存储电容（Cs）、驱动晶体管（DTFT）和阈值补偿单元（12），预充电控制单元（11）预充电阶段通过电源电压（Vdd）对存储电容（Cs）充电；阈值补偿单元（12）在阈值补偿阶段，在控制信号（EN）的控制下与驱动晶体管（DTFT）一起控制存储电容（Cs）放电直到驱动晶体管（DTFT）的第二极的电位为Vdata+Vth，在发光阶段控制驱动晶体管（DTFT）的栅源电压补偿Vth；其中，Vdata为数据线上的数据信号的电压，Vth为驱动晶体管（DTFT）的阈值电压。

Description

像素驱动电路、方法和显示装置
相关申请的交叉引用
本申请主张在2014年12月30日在中国提交的中国专利申请号No.201410841476.8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、方法和显示装置。
背景技术
由于工艺偏差，AMOLED(Active Matrix/Organic Light Emitting Diode，有源矩阵有机发光二极管面板)上的TFT(Thin Film Transistor，薄膜晶体管)的阈值电压Vth会发生偏移，导致不同的像素的电流出现不均匀的现象。现有的具有阈值补偿功能的像素驱动电路大多是在预充电阶段通过数据线上的数据信号的电压Vdata对存储电容进行充电，在补偿阶段通过存储电容放电来达到阈值补偿，之后在发光阶段驱动OLED(Organic Light Emitting Diode，有机发光二极管)发光，这样的设置会导致结构相对复杂，采用的控制信号多，从而使得像素间距小。
发明内容
本公开的主要目的在于提供一种像素驱动电路、方法和显示装置，解决现有技术中采用较多的晶体管来实现对驱动晶体管阈值电压进行补偿从而使得像素间距小的问题。
为了达到上述目的，本公开提供了一种像素驱动电路，包括预充电控制单元、存储电容、驱动晶体管和阈值补偿单元，其中，
所述驱动晶体管，栅极通过所述与预充电控制单元与数据线连接，第一极与发光元件连接，第二极与所述存储电容的第一端连接；
所述预充电控制单元，分别接入第一扫描信号、第二扫描信号和电源电压Vdd，分别与所述存储电容的第一端、所述驱动晶体管的栅极和数据线连接，并通过所述阈值补偿单元与所述存储电容的第二端连接；
所述阈值补偿单元，接入控制信号，分别与所述驱动晶体管的栅极、所 述驱动晶体管的第一极、所述存储电容的第二端和地端连接，用于在预充电阶段在所述控制信号的控制下导通所述驱动晶体管的栅极和所述存储电容的第二端的连接；
所述预充电控制单元，用于在预充电阶段，在所述第一扫描信号和第二扫描信号的控制下通过所述电源电压Vdd对所述存储电容充电，使得所述存储电容的第一端的电位为Vdd；在阈值补偿阶段，在所述第二扫描信号的控制下控制所述驱动晶体管的栅极接入所述数据线在阈值补偿阶段输出的数据信号；在发光阶段，在所述第一扫描信号的控制下控制所述驱动晶体管的第二极接入所述电源电压Vdd；
所述阈值补偿单元，进一步用于在阈值补偿阶段，在所述控制信号的控制下与所述驱动晶体管一起控制所述存储电容放电直到所述驱动晶体管的第二极的电位为Vdata+Vth；还用于在发光阶段，导通所述驱动晶体管的栅极与所述存储电容的第二端的连接，从而控制所述驱动晶体管的栅源电压补偿Vth；其中，Vth为驱动晶体管的阈值电压，Vdata为所述数据信号的电压。
可选地，所述预充电控制单元包括：
第一预充电晶体管，栅极接入所述第一扫描信号，第一极与所述存储电容的第一端连接，第二极接入所述电源电压；
以及，第二预充电晶体管，栅极接入所述第二扫描信号，第一极与所述数据线连接，第二极与所述驱动晶体管的栅极连接。
可选地，所述阈值补偿单元包括：
第一补偿晶体管，栅极接入所述控制信号，第一极与所述存储电容的第二端连接，第二极与所述驱动晶体管的栅极连接；
以及，第二补偿晶体管，栅极接入所述控制信号，第一极接地，第二极与所述驱动晶体管的第一极连接。
可选地，所述第一预充电晶体管、所述第二预充电晶体管、所述第二补偿晶体管和所述驱动晶体管都为NMOS管，所述第一补偿晶体管为PMOS管。
可选地，所述第一预充电晶体管、所述第二预充电晶体管、所述第二补偿晶体管和所述驱动晶体管都为PMOS管，所述第一补偿晶体管为NMOS 管。
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，所述像素驱动方法包括：
在预充电阶段，数据线输出零电平，阈值补偿单元在控制信号的控制下导通驱动晶体管的栅极和存储电容的第二端的连接，预充电控制单元在第一扫描信号和第二扫描信号的控制下通过电源电压Vdd对存储电容充电，使得存储电容的第一端的电位为Vdd；
在阈值补偿阶段，数据线输出数据信号，驱动晶体管导通，预充电控制单元在第二扫描信号的控制下控制驱动晶体管的栅极接入所述数据信号，阈值补偿单元在控制信号的控制下与驱动晶体管一起控制存储电容放电直到驱动晶体管的第二极的电位为Vdata+Vth；其中，Vth为驱动晶体管的阈值电压，Vdata为所述数据信号的电压；
在发光阶段，预充电控制单元在第一扫描信号的控制下控制驱动晶体管的第二极接入所述电源电压Vdd，阈值补偿单元导通驱动晶体管的栅极与存储电容的第二端的连接，使得驱动晶体管驱动发光元件发光，并控制所述驱动晶体管的栅源电压补偿Vth。
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，所述像素驱动方法包括：
在预充电阶段，数据线输出零电平，在控制信号的控制下，第一阈值补偿晶体管导通，在第一扫描信号和第二扫描信号的控制下，第一预充电晶体管和第二预充电晶体管都导通，通过电源电压对存储电容充电；
在阈值补偿阶段，所述第一扫描信号控制所述第一预充电晶体管断开，所述第二扫描信号继续控制所述第二预充电晶体管导通；数据线输出数据信号，以控制驱动晶体管导通，控制信号控制第二补偿晶体管导通，所述存储电容通过所述驱动晶体管和所述第二补偿晶体管向地端放电，直至驱动晶体管的第二极的电位为Vdata+Vth；其中，Vth为驱动晶体管的阈值电压，Vdata为所述数据信号的电压；
在发光阶段，第一扫描信号控制第一预充电晶体管导通，使得驱动晶体管的第二极接入所述电源电压Vdd，控制信号控制第一补偿晶体管导通而第 二补偿晶体管断开，以导通驱动晶体管的栅极与存储电容的第二端的连接，使得驱动晶体管导通以驱动发光元件发光，并控制所述驱动晶体管的栅源电压补偿Vth。
本公开还提供了一种显示装置，包括上述的像素驱动电路。
与现有技术相比，本公开所述的像素驱动电路、方法和显示装置，在对驱动晶体管的阈值电压进行补偿时，采用数据信号直接控制驱动晶体管，可以节省晶体管数目，从而能够减小电路设计的空间，增加像素间距。
附图说明
图1是本公开实施例所述的像素驱动电路的电路图；
图2是本公开另一实施例所述的像素驱动电路的电路图；
图3是本公开一实施例所述的像素驱动电路的信号时序图；
图4A是本公开一实施例所述的像素驱动电路在预充电阶段S1的工作示意图；
图4B是本公开一实施例所述的像素驱动电路在阈值补偿阶段S2的工作示意图；
图4C是本公开一实施例所述的像素驱动电路在发光阶段S3的工作示意图；
图5是本公开又一实施例所述的像素驱动电路的信号时序图。
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，将晶体管除栅极之外的两极分别称为第一极和第二极。
如图1所示，本公开实施例所述的像素驱动电路，包括预充电控制单元11、存储电容Cs、驱动晶体管DTFT和阈值补偿单元12，其中，
所述驱动晶体管DTFT，栅极通过所述预充电控制单元11与数据线Data 连接，第一极与发光元件D1的阳极连接，第二极与所述存储电容Cs的第一端A连接；发光元件D1的阴极与地端GND连接；
所述预充电控制单元11，分别接入第一扫描信号Scan1、第二扫描信号Scan2和电源电压Vdd，还分别与所述存储电容Cs的第一端A、所述驱动晶体管的栅极和数据线Data连接，并通过所述阈值补偿单元与所述存储电容Cs的第二端B连接。
所述阈值补偿单元12，接入控制信号EN，分别与所述驱动晶体管DTFT的栅极、所述驱动晶体管DTFT的第一极、所述存储电容Cs的第二端B和地端GND连接，用于在预充电阶段在所述控制信号EN的控制下导通所述驱动晶体管DTFT的栅极与所述存储电容Cs的第二端B的连接；
所述预充电控制单元，用于在预充电阶段，在所述第一扫描信号Scan1和所述第二扫描信号Scan2的控制下通过所述电源电压Vdd对所述存储电容Cs充电，使得所述存储电容Cs的第一端的电位为Vdd；在阈值补偿阶段，在所述第二扫描信号Scan2的控制下控制所述驱动晶体管DTFT的栅极接入所述数据线Data在阈值补偿阶段输出的数据信号；在发光阶段，在所述第一扫描信号Scan1的控制下控制所述驱动晶体管DTFT的第二极接入所述电源电压Vdd。
所述阈值补偿单元12，用于在阈值补偿阶段，在所述控制信号EN的控制下与所述驱动晶体管DTFT一起控制所述存储电容Cs放电直到所述驱动晶体管DTFT的第二极的电位为Vdata+Vth；还用于在发光阶段，导通所述驱动晶体管DTFT的栅极与所述存储电容Cs的第二端B的连接，从而控制所述驱动晶体管DTFT的栅源电压补偿Vth；其中，Vdata为所述数据信号的电压，Vth为驱动晶体管DTFT的阈值电压。
本公开实施例所述的像素驱动电路采用数据线Data上的数据信号直接控制驱动晶体管DTFT，可以在补偿驱动晶体管的阈值电压的同时，节省晶体管数目，从而能够减小电路占用的空间，增加像素间距。
在具体实施时，所述预充电控制单元可以包括：
第一预充电晶体管，栅极接入所述第一扫描信号，第一极与所述存储电容的第一端连接，第二极接入所述电源电压；
以及，第二预充电晶体管，栅极接入所述第二扫描信号，第一极与所述数据线连接，第二极与所述驱动晶体管的栅极连接。
在具体实施时，所述阈值补偿单元可以包括：
第一补偿晶体管，栅极接入所述控制信号，第一极与所述存储电容的第二端连接，第二极与所述驱动晶体管的栅极连接；
以及，第二补偿晶体管，栅极接入所述控制信号，第一极接地，第二极与所述驱动晶体管的第一极连接。
下面通过具体实施例来说明本公开所述的像素驱动电路。
如图2所示，在本公开一具体实施例所述的像素驱动电路中，所述发光元件为发光二极管OLED。
所述预充电控制单元包括：
第一预充电晶体管T11，栅极接入所述第一扫描信号Scan1，第一极与所述存储电容Cs的第一端A连接，第二极接入所述电源电压Vdd；
以及，第二预充电晶体管T12，栅极接入所述第二扫描信号Scan2，第一极与数据线Data连接，第二极与所述驱动晶体管DTFT的栅极连接。
所述阈值补偿单元包括：
第一补偿晶体管T21，栅极接入所述控制信号EN，第一极与所述存储电容Cs的第二端B连接，第二极与所述驱动晶体管DTFT的栅极连接；
以及，第二补偿晶体管T22，栅极接入所述控制信号EN，第一极与地端GND连接，第二极与所述驱动晶体管DTFT的第一极连接；
所述驱动晶体管DTFT，栅极经由第二预充电晶体管T12与数据线Data连接，第一极与发光二极管OLED的阳极连接，第二极与第一预充电晶体管T11的第一极连接；
发光二极管OLED的阴极与地端GND连接。
在图2所示的像素驱动电路的实施例中，所述第一预充电晶体管、所述第二预充电晶体管、所述第二补偿晶体管和所述驱动晶体管都为NMOS(N-Mental-Oxide-Semiconductor，N型金属-氧化物-半导体)管，所述第一补偿晶体管为PMOS(P-Mental-Oxide-Semiconductor，P型金属-氧化物-半导体)管。其中，将所述第一补偿晶体管和所述第二补偿晶体管设置为类型相反的 MOS管，从而可以减少控制信号的个数，方便电路设计。
本公开如图2所示的像素驱动电路的实施例采用5T1C结构来实现对驱动晶体管的阈值电压的补偿，采用数据信号直接控制驱动晶体管，节省了晶体管，比起6T1C结构来说减少了一个晶体管。并且采用一个控制信号即可以控制类型相反的两个补偿晶体管，减少了控制信号的数目，从而可以能够节省电路占用的空间，增加像素间距。
图3是第一扫描信号Scan1、第二扫描信号Scan2、控制信号EN和Vdata在预充电阶段S1、阈值补偿阶段S2和发光阶段S3的时序图。相应地，如图2所示的像素驱动电路在工作时：
如图4A所示，在预充电阶段S1，第一扫描信号Scan1和第二扫描信号Scan2都为高电平，数据线Data输出零电平，控制信号EN为低电平，第一预充电晶体管T11和第二预充电晶体管T12都导通，第一补偿晶体管T21导通，通过电源电压Vdd对存储电容Cs充电；
如图4B所示，在阈值补偿阶段S2，第一扫描信号Scan1跳变为低电平，第二扫描信号Scan2仍为高电平，控制信号EN跳变为高电平，所述第一预充电晶体管T11断开，所述第二预充电晶体管T12继续导通，此时数据线Data输出数据信号，以控制驱动晶体管DTFT导通，第二补偿晶体管T22导通，所述存储电容Cs通过所述驱动晶体管DTFT和所述第二补偿晶体管T22向地端GND放电，直至驱动晶体管DTFT的第二极的电位，即A点的电位为Vdata+Vth；Vth为驱动晶体管DTFT的阈值电压，Vdata为数据线Data上的数据信号的电压；
如图4C所示，在发光阶段S3，第一扫描信号Scan1跳变为高电平，第二扫描信号Scan2跳变为低电平，所述第一预充电晶体管T11导通，所述第二预充电晶体管T12断开，使得驱动晶体管DTFT的第二极接入所述电源电压Vdd，控制信号EN跳变为低电平，所述控制信号EN控制第一补偿晶体管T21导通而所述第二补偿晶体管T22断开，以导通驱动晶体管DTFT的栅极与存储电容的第二端B的连接，此时DTFT的栅极电位被存储电容自举为Vdd-(Vdata+Vth)，驱动晶体管导通以驱动发光元件发光，此时流过OLED的电流I＝K×(Vdd-(Vdd-Vdata-Vth)-Vth)2＝K×Vdata2，其中，K为常数； 由此，所述驱动晶体管DTFT的栅源电压补偿了Vth。
在图4A、图4B和图4C中，用虚线框起来的晶体管是导通的。
在具体实施时，在如图2所示的像素驱动电路的实施例中，所述第一预充电晶体管T11、所述第二预充电晶体管T12、所述第二补偿晶体管T22和所述驱动晶体管DTFT也可以都为PMOS管，则所述第一补偿晶体管T21可以为NMOS管。在实际操作时，如图5所示，只需将图3中的第一扫描信号Scan1、第二扫描信号Scan2、数据线Data上的数据信号和控制信号EN设置为反相即可。以上晶体管类型的变化和各信号的时序的变化为本领域技术人员所公知，在此不再赘述。
本公开实施例还提供了一种像素驱动方法，应用于上述的像素驱动电路，包括：
在预充电阶段，数据线输出零电平，阈值补偿单元在控制信号的控制下导通驱动晶体管的栅极和存储电容的第二端的连接，预充电控制单元在第一扫描信号和第二扫描信号的控制下通过电源电压Vdd对存储电容充电，使得存储电容的第一端的电位为Vdd；
在阈值补偿阶段，数据线输出数据信号，驱动晶体管导通，预充电控制单元在第二扫描信号的控制下控制驱动晶体管的栅极接入所述数据信号，阈值补偿单元在控制信号的控制下与驱动晶体管一起控制存储电容放电直到驱动晶体管的第二极的电位为Vdata+Vth；其中，Vth为驱动晶体管的阈值电压，Vdata为所述数据信号的电压；
在发光阶段，预充电控制单元在第一扫描信号的控制下控制驱动晶体管的第二极接入所述电源电压Vdd，阈值补偿单元导通驱动晶体管的栅极与存储电容的第二端的连接，使得驱动晶体管驱动发光元件发光，并控制所述驱动晶体管的栅源电压补偿Vth。
本公开实施例还提供了一种像素驱动方法，应用于上述的像素驱动电路，包括：
在预充电阶段，数据线输出零电平，在控制信号的控制下，第一阈值补偿晶体管导通，在第一扫描信号和第二扫描信号的控制下，第一预充电晶体管和第二预充电晶体管都导通，通过电源电压对存储电容充电；
在阈值补偿阶段，所述第一扫描信号控制所述第一预充电晶体管断开，所述第二扫描信号继续控制所述第二预充电晶体管导通；数据线输出数据信号，以控制驱动晶体管导通，控制信号控制第二补偿晶体管导通，所述存储电容通过所述驱动晶体管和所述第二补偿晶体管向地端放电，直至驱动晶体管的第二极的电位为Vdata+Vth；其中，Vth为驱动晶体管的阈值电压，Vdata为所述数据信号的电压；
在发光阶段，第一扫描信号控制第一预充电晶体管导通，使得驱动晶体管的第二极接入所述电源电压Vdd，控制信号控制第一补偿晶体管导通而第二补偿晶体管断开，以导通驱动晶体管的栅极与存储电容的第二端的连接，使得驱动晶体管导通以驱动发光元件发光，并控制所述驱动晶体管的栅源电压补偿Vth。
本公开实施例所述的显示装置，包括上述的像素驱动电路。
该显示装置可以为液晶显示器、液晶电视、OLED(Organic Light-Emitting Diode，有机电致发光二极管)显示面板、OLED显示器、OLED电视或电子纸等显示装置。
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 (8)

  1. 一种像素驱动电路，包括预充电控制单元、存储电容、驱动晶体管和阈值补偿单元，其中，
    所述驱动晶体管，栅极通过所述与预充电控制单元与数据线连接，第一极与发光元件连接，第二极与所述存储电容的第一端连接；
    所述预充电控制单元，分别接入第一扫描信号、第二扫描信号和电源电压Vdd，分别与所述存储电容的第一端、所述驱动晶体管的栅极和数据线连接，并通过所述阈值补偿单元与所述存储电容的第二端连接；
    所述阈值补偿单元，接入控制信号，分别与所述驱动晶体管的栅极、所述驱动晶体管的第一极、所述存储电容的第二端和地端连接，用于在预充电阶段在所述控制信号的控制下导通所述驱动晶体管的栅极和所述存储电容的第二端的连接；
    所述预充电控制单元，用于在预充电阶段，在所述第一扫描信号和第二扫描信号的控制下通过所述电源电压Vdd对所述存储电容充电，使得所述存储电容的第一端的电位为Vdd；在阈值补偿阶段，在所述第二扫描信号的控制下控制所述驱动晶体管的栅极接入所述数据线在阈值补偿阶段输出的数据信号；在发光阶段，在所述第一扫描信号的控制下控制所述驱动晶体管的第二极接入所述电源电压Vdd；
    所述阈值补偿单元，进一步用于在阈值补偿阶段，在所述控制信号的控制下与所述驱动晶体管一起控制所述存储电容放电直到所述驱动晶体管的第二极的电位为Vdata+Vth；还用于在发光阶段，导通所述驱动晶体管的栅极与所述存储电容的第二端的连接，从而控制所述驱动晶体管的栅源电压补偿Vth；其中，Vth为驱动晶体管的阈值电压，Vdata为所述数据信号的电压。
  2. 如权利要求1所述的像素驱动电路，其中，所述预充电控制单元包括：
    第一预充电晶体管，栅极接入所述第一扫描信号，第一极与所述存储电容的第一端连接，第二极接入所述电源电压；
    以及，第二预充电晶体管，栅极接入所述第二扫描信号，第一极与所述数据线连接，第二极与所述驱动晶体管的栅极连接。
  3. 如权利要求2所述的像素驱动电路，其中，所述阈值补偿单元包括：
    第一补偿晶体管，栅极接入所述控制信号，第一极与所述存储电容的第二端连接，第二极与所述驱动晶体管的栅极连接；
    以及，第二补偿晶体管，栅极接入所述控制信号，第一极接地，第二极与所述驱动晶体管的第一极连接。
  4. 如权利要求3所述的像素驱动电路，其中，所述第一预充电晶体管、所述第二预充电晶体管、所述第二补偿晶体管和所述驱动晶体管都为NMOS管，所述第一补偿晶体管为PMOS管。
  5. 如权利要求3所述的像素驱动电路，其中，所述第一预充电晶体管、所述第二预充电晶体管、所述第二补偿晶体管和所述驱动晶体管都为PMOS管，所述第一补偿晶体管为NMOS管。
  6. 一种像素驱动方法，应用于如权利要求1至5中任一权利要求所述的像素驱动电路，其中，所述像素驱动方法包括：
    在预充电阶段，数据线输出零电平，阈值补偿单元在控制信号的控制下导通驱动晶体管的栅极和存储电容的第二端的连接，预充电控制单元在第一扫描信号和第二扫描信号的控制下通过电源电压Vdd对存储电容充电，使得存储电容的第一端的电位为Vdd；
    在阈值补偿阶段，数据线输出数据信号，驱动晶体管导通，预充电控制单元在第二扫描信号的控制下控制驱动晶体管的栅极接入所述数据信号，阈值补偿单元在控制信号的控制下与驱动晶体管一起控制存储电容放电直到驱动晶体管的第二极的电位为Vdata+Vth；其中，Vth为驱动晶体管的阈值电压，Vdata为所述数据信号的电压；
    在发光阶段，预充电控制单元在第一扫描信号的控制下控制驱动晶体管的第二极接入所述电源电压Vdd，阈值补偿单元导通驱动晶体管的栅极与存储电容的第二端的连接，使得驱动晶体管驱动发光元件发光，并控制所述驱动晶体管的栅源电压补偿Vth。
  7. 一种像素驱动方法，应用于如权利要求3至5中任一权利要求所述的像素驱动电路，其中，所述像素驱动方法包括：
    在预充电阶段，数据线输出零电平，在控制信号的控制下，第一阈值补 偿晶体管导通，在第一扫描信号和第二扫描信号的控制下，第一预充电晶体管和第二预充电晶体管都导通，通过电源电压对存储电容充电；
    在阈值补偿阶段，所述第一扫描信号控制所述第一预充电晶体管断开，所述第二扫描信号继续控制所述第二预充电晶体管导通；数据线输出数据信号，以控制驱动晶体管导通，控制信号控制第二补偿晶体管导通，所述存储电容通过所述驱动晶体管和所述第二补偿晶体管向地端放电，直至驱动晶体管的第二极的电位为Vdata+Vth；其中，Vth为驱动晶体管的阈值电压，Vdata为所述数据信号的电压；
    在发光阶段，第一扫描信号控制第一预充电晶体管导通，使得驱动晶体管的第二极接入所述电源电压Vdd，控制信号控制第一补偿晶体管导通而第二补偿晶体管断开，以导通驱动晶体管的栅极与存储电容的第二端的连接，使得驱动晶体管导通以驱动发光元件发光，并控制所述驱动晶体管的栅源电压补偿Vth。
  8. 一种显示装置，包括如权利要求1至5中任一权利要求所述的像素驱动电路。
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