WO2022016760A1 - 像素电路及其驱动方法、显示装置 - Google Patents

像素电路及其驱动方法、显示装置 Download PDF

Info

Publication number
WO2022016760A1
WO2022016760A1 PCT/CN2020/130838 CN2020130838W WO2022016760A1 WO 2022016760 A1 WO2022016760 A1 WO 2022016760A1 CN 2020130838 W CN2020130838 W CN 2020130838W WO 2022016760 A1 WO2022016760 A1 WO 2022016760A1
Authority
WO
WIPO (PCT)
Prior art keywords
transistor
control
terminal
anode
initialization
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2020/130838
Other languages
English (en)
French (fr)
Inventor
王选芸
戴超
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Original Assignee
Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd filed Critical Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority to US17/266,999 priority Critical patent/US11929023B2/en
Publication of WO2022016760A1 publication Critical patent/WO2022016760A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms
    • G09G2310/061—Details of flat display driving waveforms for resetting or blanking
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
    • G09G2320/0214—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display with crosstalk due to leakage current of pixel switch in active matrix panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0238—Improving the black level

Definitions

  • the present application relates to the field of display technology, and in particular, to a pixel circuit, a driving method thereof, and a display device.
  • FIG. 1 is an equivalent circuit diagram of a pixel circuit of a conventional single pixel.
  • the pixel circuit of a single pixel includes a driving transistor T1, a switching transistor T2, a compensation transistor T3, an initialization transistor T4, a first light emission control transistor T5, a second light emission control transistor T6, an anode reset transistor T7, a storage capacitor C and an organic light emitting diode OLED.
  • the control terminal of the driving transistor T1 is connected to the first terminal of the storage capacitor C, the first terminal of the compensation transistor T3 and the first terminal of the initialization transistor T4, and the first terminal of the driving transistor T1 is connected to the first terminal through the first light emission control transistor T5.
  • the power supply voltage terminal ELVDD, the second terminal of the driving transistor T1 is connected to the anode of the organic light emitting diode OLED through the second light emission control transistor T6.
  • the first terminal of the switching transistor T2 is connected to the data signal terminal Data, the second terminal of the switching transistor T2 is connected to the first terminal of the driving transistor T1, and the control terminal of the switching transistor T2 is connected to the nth scan signal terminal Scan(n), where n is greater than or An integer equal to 2.
  • the control end of the compensation transistor T3 is connected to the nth scan signal end Scan(n), the first end of the compensation transistor T3 is connected to the control end of the driving transistor T1, and the second end of the compensation transistor T3 is connected to the second end of the driving transistor T1.
  • the control end of the initialization transistor T4 is connected to the n-1th scan drive signal end Scan(n-1), the first end of the initialization transistor T4 is connected to the control end of the drive transistor T1, and the second end of the initialization transistor T4 is connected to the initialization signal end Vint connection.
  • the control terminal of the first light-emitting control transistor T5 and the control terminal of the second light-emitting control transistor T6 are both connected to the light-emitting control signal terminal EM.
  • the control terminal of the anode reset transistor T7 is connected to the nth scan signal terminal Scan(n), the first terminal of the anode reset transistor T7 is connected to the anode of the organic light emitting diode OLED, and the second terminal of the anode reset transistor T7 is connected to the initialization signal terminal Vint .
  • the cathode of the organic light emitting diode OLED is connected to the second power supply voltage terminal ELVSS.
  • the driving transistor T1, the switching transistor T2, the compensation transistor T3, the initialization transistor T4, the first light-emitting control transistor T5, the second light-emitting control transistor T6 and the anode reset transistor T7 are all P-type thin film transistors with a low temperature polysilicon active layer .
  • Low temperature polysilicon thin film transistor has an Achilles heel is the large leakage current.
  • the purpose of the present application is to provide a pixel circuit, a driving method thereof, and a display device, so as to improve the problem of uneven brightness caused by anode shunting in the light-emitting display of organic light emitting diodes at low gray levels.
  • the present application provides a pixel circuit, the pixel circuit includes:
  • an organic light emitting diode a driving transistor, the output end of the driving transistor is electrically connected to the anode of the organic light emitting diode; a compensation transistor, the first end of the compensation transistor is connected to the output end of the driving transistor, the compensation transistor
  • the second end of the initialization transistor is electrically connected to the control end of the drive transistor; the initialization transistor, the input end of the initialization transistor is connected to the initialization signal line, the output end of the initialization transistor is connected to the second end of the compensation transistor, and The output terminal of the initialization transistor is electrically connected to the control terminal of the driving transistor; and an anode reset transistor, the input terminal of the anode reset transistor is connected to the output terminal of the driving transistor and the first terminal of the compensation transistor, the The output terminal of the anode reset transistor is connected to the anode of the organic light emitting diode.
  • the pixel circuit further includes an anti-leakage transistor, the anti-leakage transistor is connected between the second terminal of the compensation transistor and the control terminal of the driving transistor, and the anti-leakage transistor is connected to between the output terminal of the initialization transistor and the control terminal of the driving transistor, wherein at least one of the anti-leakage transistor, the initialization transistor and the compensation transistor is a transistor with a metal oxide active layer .
  • the leakage prevention transistor and the compensation transistor are both N-type transistors having a metal oxide active layer.
  • control terminal of the anti-leakage transistor and the control terminal of the compensation transistor are both connected to the first control signal line.
  • the leakage prevention transistor is an N-type transistor with a metal oxide active layer
  • the compensation transistor is a P-type transistor with a polysilicon active layer.
  • the anode reset transistor is an N-type transistor having a metal oxide active layer.
  • the anode reset transistor and the initialization transistor are both P-type transistors with a polysilicon active layer, and the control terminal of the initialization transistor and the control terminal of the anode reset transistor are both connected to the second control terminal. Signal line connection.
  • the pixel circuit further includes: a switch transistor, the input end of the switch transistor is connected to the data signal line, and the output end of the switch transistor is connected to the input end of the drive transistor; the first light emission control transistor, the input end of the first light-emitting control transistor is connected to the power supply signal line, the output end of the first light-emitting control transistor is connected to the input end of the driving transistor; the second light-emitting control transistor, the second light-emitting control transistor The input end of the transistor is connected to the output end of the driving transistor, the first end of the compensation transistor and the input end of the anode reset transistor, and the output end of the second light-emitting control transistor is connected to the anode of the organic light emitting diode connection; a capacitor, the first end of the capacitor is connected to the power supply signal line, and the second end of the capacitor is connected to the control end of the driving transistor.
  • the driving transistor, the switching transistor, the first light emission control transistor and the second light emission control transistor are all P-type transistors with a polysilicon active layer.
  • a driving method for the above pixel circuit comprising the steps of: in an anode reset stage, the driving transistor is turned off, the compensation transistor is turned on, the initialization transistor is turned on, and the reset signal line input is reset.
  • the signal is transmitted to the input terminal of the anode reset transistor through the turned-on compensation transistor, and the turned-on anode reset transistor outputs the reset signal to the anode of the organic light emitting diode; in the light-emitting stage, the The anode reset transistor is turned off, the compensation transistor is turned off, the initialization transistor is turned off, and the driving transistor is turned on and outputs a driving current to the anode of the organic light emitting diode.
  • a display device comprising a pixel circuit, the pixel circuit comprising:
  • an organic light emitting diode a driving transistor, the output end of the driving transistor is electrically connected to the anode of the organic light emitting diode; a compensation transistor, the first end of the compensation transistor is connected to the output end of the driving transistor, the compensation transistor
  • the second end of the initialization transistor is electrically connected to the control end of the drive transistor; the initialization transistor, the input end of the initialization transistor is connected to the initialization signal line, the output end of the initialization transistor is connected to the second end of the compensation transistor, and The output terminal of the initialization transistor is electrically connected to the control terminal of the driving transistor; and an anode reset transistor, the input terminal of the anode reset transistor is connected to the output terminal of the driving transistor and the first terminal of the compensation transistor, the The output terminal of the anode reset transistor is connected to the anode of the organic light emitting diode.
  • the pixel circuit further includes an anti-leakage transistor, the anti-leakage transistor is connected between the second terminal of the compensation transistor and the control terminal of the driving transistor, and the anti-leakage transistor is connected to between the output terminal of the initialization transistor and the control terminal of the driving transistor, wherein at least one of the anti-leakage transistor, the initialization transistor and the compensation transistor has a metal oxide active layer transistor.
  • the leakage prevention transistor and the compensation transistor are both N-type transistors having a metal oxide active layer.
  • control terminal of the anti-leakage transistor and the control terminal of the compensation transistor are both connected to the first control signal line.
  • the leakage prevention transistor is an N-type transistor with a metal oxide active layer
  • the compensation transistor is a P-type transistor with a polysilicon active layer.
  • the anode reset transistor is an N-type transistor having a metal oxide active layer.
  • the anode reset transistor and the initialization transistor are both P-type transistors with a polysilicon active layer, and the control terminal of the initialization transistor and the control terminal of the anode reset transistor are both connected to the second transistor. Control signal line connection.
  • the pixel circuit further comprises: a switch transistor, the input end of the switch transistor is connected to the data signal line, the output end of the switch transistor is connected to the input end of the drive transistor; the first light-emitting a control transistor, the input end of the first light-emitting control transistor is connected to the power supply signal line, the output end of the first light-emitting control transistor is connected to the input end of the driving transistor; the second light-emitting control transistor, the second light-emitting control transistor The input end of the control transistor is connected to the output end of the driving transistor, the first end of the compensation transistor and the input end of the anode reset transistor, and the output end of the second light emission control transistor is connected to the output end of the organic light emitting diode.
  • Anode connection; capacitor, the first end of the capacitor is connected to the power signal line, and the second end of the capacitor is connected to the control end of the driving transistor.
  • the driving transistor, the switching transistor, the first light emission control transistor and the second light emission control transistor are all P-type transistors having a polysilicon active layer.
  • the present application provides a pixel circuit, a driving method thereof, and a display device.
  • the pixel circuit includes: an organic light-emitting diode; a driving transistor, an output end of the driving transistor is electrically connected to an anode of the organic light-emitting diode; a compensation transistor, a first end of the compensation transistor is connected to The output end of the drive transistor is connected, and the second end of the compensation transistor is electrically connected with the control end of the drive transistor; for the initialization transistor, the input end of the initialization transistor is connected with the initialization signal line, and the output end of the initialization transistor is connected with the second end of the compensation transistor, And the output terminal of the initialization transistor is electrically connected with the control terminal of the driving transistor; and the anode reset transistor, the input terminal of the anode reset transistor is connected with the output terminal of the driving transistor and the first terminal of the compensation transistor, and the output terminal of the anode reset transistor is connected to the organic light-emitting diode
  • the input terminal of the reset transistor through the anode is connected with the output terminal of the driving transistor and the output terminal of the reset transistor through the anode is connected with the anode of the organic light emitting diode, so that the anode of the light emitting diode is in the light-emitting state and the current leaked through the reset transistor by the anode is collected.
  • the current collected to the output end of the driving transistor is at least partially transferred to the anode of the organic light emitting diode, which improves the problem of uneven brightness caused by anode shunting in low grayscale light-emitting display of the organic light emitting diode.
  • the compensation transistor and the initialization transistor are connected between the anode reset transistor and the initialization signal line, so that the reset signal input from the initialization signal line is transmitted to the anode reset transistor through the conductive compensation transistor and the initialization transistor, and then transmitted to the organic
  • the anodes of light-emitting diodes provide a new anode reset path relative to conventional technologies.
  • FIG. 1 is an equivalent circuit diagram of a pixel circuit of a conventional single pixel
  • 2A is an equivalent circuit diagram of a pixel circuit of a single pixel according to the first embodiment of the present application
  • FIG. 2B is a driving timing diagram corresponding to the equivalent circuit diagram of the pixel circuit shown in FIG. 2A;
  • 3A is an equivalent circuit diagram of a pixel circuit of a single pixel according to the second embodiment of the present application.
  • 3B is a driving timing diagram corresponding to the equivalent circuit diagram of the pixel circuit shown in FIG. 3A;
  • FIG. 4 is an equivalent circuit diagram of a pixel circuit of a single pixel according to a third embodiment of the present application.
  • the present application provides a display device including a display panel and a source driver.
  • the display panel is an organic light emitting diode display panel.
  • the display panel includes a display area and a non-display area outside the display area.
  • the display area of the display panel is provided with a plurality of pixel circuits arranged in an array, and the display area of the display panel is also provided with scan signal lines, data signal lines, initialization signal lines, power supply voltage signal lines and light emission control signal lines.
  • the source driver is electrically connected to the data signal line, and inputs the data signal to the data signal line.
  • the non-display area of the display panel is provided with a gate drive circuit (Gate On Array, GOA), the gate driving circuit is used for outputting gate control signals, and the gate control signals include scan signals input to the scan signal lines and light emitting control signals input to the light emitting control signal lines.
  • GOA Gate On Array
  • the pixel circuit includes an organic light emitting diode, a switching transistor, a driving transistor, a compensation transistor, an initialization transistor, an anode reset transistor, a first light emission control transistor, and a second light emission control transistor.
  • An organic light emitting diode includes a cathode, an anode, and an organic light emitting layer between the cathode and the anode.
  • the organic light-emitting diode emits light under the action of driving currents of different magnitudes to display different gray scales.
  • the current flowing through the organic light emitting diode is small. If the current flowing into the organic light emitting diode is shunted through the anode of the organic light emitting diode, the shunting will significantly affect the display effect when the organic light emitting diode displays a low gray scale.
  • the control terminal of the driving transistor is connected to the second terminal of the capacitor, and is electrically connected to the output terminal of the initialization transistor and the second terminal of the compensation transistor.
  • the input end of the driving transistor is connected to the power supply signal line through the first light emission control transistor.
  • the output end of the driving transistor is electrically connected to the anode of the organic light emitting diode through the second light emitting control transistor.
  • the driving transistor is used to provide driving current to the organic light emitting diode.
  • the control end of the switch transistor is connected to the third control signal line, the input end of the switch transistor is connected to the data signal line, and the output end of the switch transistor is connected to the input end of the drive transistor.
  • the third control signal line is the third scan signal line, and the third control signal line is used for inputting the third control signal from the gate driving circuit.
  • the switch transistor is used for transmitting the data signal input from the data signal line to the input terminal of the driving transistor according to the third control signal.
  • the first end of the compensation transistor is connected to the output end of the driving transistor, and the second end of the compensation transistor is electrically connected to the control end of the driving transistor.
  • the compensation transistor is used to electrically connect the output terminal of the driving transistor with the control terminal of the driving transistor.
  • the input end of the initialization transistor is connected with the initialization signal line, the output end of the initialization transistor is connected with the second end of the compensation transistor, and the output end of the initialization transistor is electrically connected with the control end of the driving transistor.
  • the initialization signal line is used for inputting the initialization signal, and the initialization signal line can also be used for inputting the reset signal.
  • the initialization transistor is used for transmitting the initialization signal input from the initialization signal line to the control terminal of the driving transistor, so as to realize the initialization of the control terminal of the driving transistor.
  • the initialization transistor is also used to transmit the initialization signal or reset signal to the anode reset transistor through the conductive compensation transistor, and the conductive anode reset transistor transmits the initialization signal or reset signal to the anode of the organic light-emitting diode, so as to realize the anode of the organic light-emitting diode. initialization.
  • the input end of the anode reset transistor is connected to the output end of the driving transistor and the first end of the compensation transistor, and the output end of the anode reset transistor is connected to the anode of the organic light emitting diode.
  • the input terminal of the anode reset transistor is connected to the output terminal of the driving transistor, so that the anode of the organic light emitting diode is collected to the output terminal of the driving transistor through the current leaked by the anode reset transistor, and the current collected to the output terminal of the driving transistor still flows into the organic light emitting diode at least partially. diode.
  • the input end of the anode reset transistor is connected to the first end of the compensation transistor, so that the input end of the anode reset transistor receives an initialization signal or a reset signal from the initialization transistor through the turned-on compensation transistor, so as to reset the anode of the organic light emitting diode.
  • the pixel circuit also includes an anti-leakage transistor, the anti-leakage transistor is connected between the second end of the compensation transistor and the control end of the driving transistor, and the anti-leakage transistor is connected between the output end of the initialization transistor and the control end of the driving transistor, preventing electric leakage
  • At least one of the transistor, the initialization transistor, and the compensation transistor is a transistor having a metal oxide active layer.
  • At least one of the anti-leakage transistor, the initialization transistor and the compensation transistor is a transistor with a metal oxide active layer, so as to reduce the leakage of the control terminal of the driving transistor and avoid the leakage of the control terminal of the driving transistor when the driving transistor drives the OLED display.
  • the anti-leakage transistor is connected between the second end of the compensation transistor and the control end of the driving transistor
  • the anti-leakage transistor is connected between the output end of the initialization transistor and the control end of the driving transistor, preventing electric leakage
  • At least one of the transistor, the initialization transistor, and the compensation transistor
  • both the leakage prevention transistor and the compensation transistor are N-type transistors with a metal oxide active layer
  • both the leakage prevention transistor and the compensation transistor have low leakage characteristics.
  • the low leakage characteristic of the anti-leakage transistor suppresses the potential variation of the control terminal of the driving transistor within a frame time
  • the low leakage characteristic of the compensation transistor further prevents the control terminal of the driving transistor from leaking through the compensation transistor.
  • the leakage current collected by the anode reset transistor to the driving transistor will not leak from the compensation transistor, but flow into the organic light-emitting diode through the second light-emitting control transistor, thereby further improving the display of the organic light-emitting diode.
  • the control terminal of the anti-leakage transistor and the control terminal of the compensation transistor are both connected to the first control signal line, so that the anti-leakage transistor and the compensation transistor are controlled by the same control signal to be turned on or off.
  • the first control signal line is used for inputting the first control signal input by the gate driving circuit, and the first control signal line is the first scanning signal line.
  • the anti-leakage transistor is an N-type transistor with a metal oxide active layer
  • the compensation transistor is a P-type transistor with a polysilicon active layer
  • the anti-leakage transistor functions to suppress the potential change of the control terminal of the driving transistor.
  • the manufacture of P-type polysilicon transistors is simpler than that of N-type metal oxide transistors.
  • P-type compensation transistors and transistors with polysilicon active layers are more conducive to reducing process risks and improving product yield.
  • the anode reset transistor When the anode reset transistor is an N-type transistor with a metal oxide active layer, the anode reset transistor has a low leakage characteristic, which prevents the anode of the organic light emitting diode from leaking electricity through the closed anode reset transistor, thereby improving the display of low gray scale of the organic light emitting diode. uneven brightness problem.
  • both the anode reset transistor and the initialization transistor are P-type transistors with a polysilicon active layer
  • the control terminal of the initialization transistor and the control terminal of the anode reset transistor are both connected to the second control signal line, so that both are controlled by the same control
  • the signal is thus turned on or off.
  • the second control signal line is used for inputting the second control signal output by the gate driving circuit, and the second control signal line is the second scanning signal line.
  • the input end of the first light-emitting control transistor is connected to the power signal line
  • the output end of the first light-emitting control transistor is connected to the input end of the driving transistor
  • the control end of the first light-emitting control transistor is connected to the light-emitting control signal line.
  • the first light emitting control transistor is used for outputting the power signal input from the power signal line to the input end of the driving transistor according to the light emitting control signal input from the light emitting control signal line.
  • the input end of the second light-emitting control transistor is connected to the output end of the driving transistor, the first end of the compensation transistor and the input end of the anode reset transistor, the output end of the second light-emitting control transistor is connected to the anode of the organic light emitting diode, and the second light-emitting control transistor The control end of the transistor is connected with the light-emitting control signal line.
  • the second light emitting control transistor is used for transmitting the driving current output by the driving transistor to the anode of the organic light emitting diode according to the light emitting control signal input from the light emitting control signal line.
  • the first end of the capacitor is connected to the power signal line, and the second end of the capacitor is connected to the control end of the driving transistor.
  • the capacitor is used to maintain the potential of the control terminal of the driving transistor during the process of driving the organic light emitting diode to emit light.
  • the driving transistor, the switching transistor, the first light-emitting control transistor and the second light-emitting control transistor are all P-type transistors with a polysilicon active layer. Closed under the action. Specifically, the transistors with polysilicon active layers in the present application are all low-temperature polysilicon transistors. When the pixel circuit includes polysilicon transistors and metal oxide transistors, it is beneficial to reduce power consumption when the pixel circuit operates.
  • FIG. 2A is an equivalent circuit diagram of a pixel circuit of a single pixel according to the first embodiment of the present application.
  • the pixel circuit includes an organic light-emitting diode OLED, a driving transistor T1, a switching transistor T2, a compensation transistor T3, an initialization transistor T4, a first light-emitting control transistor T5, a second light-emitting control transistor T6, an anode reset transistor T7, an anti-leakage transistor T8 and a capacitor C .
  • the organic light emitting diode OLED includes a cathode, an anode, and an organic light-emitting layer between the cathode and the anode.
  • the cathode of the organic light emitting diode OLED is connected to the first power signal line ELVSS.
  • the anode of the organic light emitting diode OLED is connected to the output terminal of the anode reset transistor T7 and the output terminal of the second light emission control transistor T6.
  • the control terminal of the driving transistor T1 is connected to the output terminal of the anti-leakage transistor T8 and the second terminal of the capacitor C.
  • the input terminal of the driving transistor T1 is connected to the output terminal of the first light-emitting control transistor T5 and the output terminal of the switching transistor T2.
  • the output terminal of the driving transistor T1 is connected to the input terminal of the second light emission control transistor T6, the first terminal of the compensation transistor T3 and the input terminal of the anode reset transistor T7.
  • the driving transistor T1 is used to provide a driving current to the organic light emitting diode OLED.
  • the control terminal of the switching transistor T2 is connected to the third control signal line Scan(n), the input terminal of the switching transistor T2 is connected to the data signal line Data, and the output terminal of the switching transistor T2 is connected to the input terminal of the driving transistor T1.
  • the switching transistor T2 is used for transmitting the data signal input from the data signal line Data to the input terminal of the driving transistor T1 according to the third control signal input from the third control signal line Scan(n).
  • the control end of the compensation transistor T3 is connected to the first control signal line Nscan(n), the first end of the compensation transistor T3 is connected to the output end of the driving transistor T1, and the second end of the compensation transistor T3 is electrically connected to the control end of the driving transistor T1 connect.
  • the compensation transistor T3 is used to electrically connect the control terminal of the driving transistor T1 and the output terminal of the driving transistor T1 through the turned-on anti-leakage transistor T8 according to the first control signal input from the first control signal line Nscan(n).
  • the control end of the initialization transistor T4 is connected to the second control signal line Scan(n-1), the input end of the initialization transistor T4 is connected to the initialization signal line Vint, the output end of the initialization transistor T4 is connected to the second end of the compensation transistor T3, and The output terminal of the initialization transistor T4 is electrically connected to the control terminal of the driving transistor T1.
  • the initialization transistor T4 is configured to transmit the initialization signal input from the initialization signal line Vint to the control terminal of the driving transistor T1 through the turned-on anti-leakage transistor T8 according to the second control signal input from the second control signal line Scan(n-1), and
  • the initialization signal is sequentially transmitted to the anode of the organic light emitting diode OLED through the turned on compensation transistor T3 and the turned on anode reset transistor T7, so as to realize the initialization of the control terminal of the driving transistor T1 and the initialization of the anode of the organic light emitting diode OLED at the same time.
  • the anode reset is only realized by the conductive anode reset transistor T7.
  • a conductive anode reset transistor T7 is implemented.
  • the control terminal of the first lighting control transistor T5 is connected to the lighting control signal line EM, the input terminal of the first lighting control transistor T5 is connected to the second power supply signal line ELVDD, and the output terminal of the first lighting control transistor T5 is connected to the input of the driving transistor T1 end connection.
  • the first light emission control transistor T5 is used for outputting the second power supply signal input from the second power supply signal line ELVDD to the input end of the driving transistor T1 according to the light emission control signal input from the light emission control signal line EM.
  • the control terminal of the second lighting control transistor T6 is connected to the lighting control signal line EM, and the input terminal of the second lighting control transistor T6 is connected to the output terminal of the driving transistor T1, the first terminal of the compensation transistor T3 and the input terminal of the anode reset transistor T7 , the output end of the second light-emitting control transistor T6 is connected to the anode of the organic light-emitting diode OLED.
  • the second light emitting control transistor T6 is used for transmitting the driving current output by the driving transistor T1 to the anode of the organic light emitting diode OLED according to the light emitting control signal input from the light emitting control signal line.
  • the control terminal of the anode reset transistor T7 is connected to the second control signal line Scan(n-1), the input terminal of the anode reset transistor T7 is connected to the output terminal of the driving transistor T1, the first terminal of the compensation transistor T3 and the second light-emitting control transistor T6
  • the input end of the anode reset transistor T7 is connected to the anode of the organic light emitting diode OLED.
  • the anode reset transistor T7 is used to transmit the initialization signal transmitted by the turned-on initialization transistor T4 and the turned-on compensation transistor T3 to the anode of the organic light emitting diode OLED according to the second control signal input from the second control signal line Scan(n-1). .
  • the current drained by the organic light emitting diode OLED through the anode reset transistor T7 is collected to the output end of the driving transistor T1, and part of the current collected to the output end of the driving transistor T1 passes through the turned-on second light-emitting control transistor T6.
  • the flow into the anode of the organic light emitting diode OLED improves the problem of uneven display of low gray-scale brightness caused by the shunt of the anode of the organic light emitting diode OLED.
  • the control terminal of the anti-leakage transistor T8 is connected to the first control signal line Nscan(n), the anti-leakage transistor T8 is connected between the second terminal of the compensation transistor T3 and the control terminal of the driving transistor T1, and the anti-leakage transistor T8 is connected to the initialization between the output terminal of the transistor T4 and the control terminal of the driving transistor T1.
  • the anti-leakage transistor T8 is a transistor having a metal oxide active layer.
  • the first end of the capacitor C is connected to the second power signal line ELVDD, and the second end of the capacitor C is connected to the control end of the driving transistor T1.
  • the capacitor C is used to maintain the potential of the control terminal of the driving transistor T1 during the emitting process of the organic light emitting diode OLED in one frame.
  • the driving transistor T1 , the switching transistor T2 , the initialization transistor T4 , the first light-emitting control transistor T5 , the second light-emitting control transistor T6 and the anode reset transistor T7 are all P-type transistors with a polysilicon active layer.
  • the compensation transistor T3 and the anti-leakage transistor T8 are both N-type transistors with a metal oxide active layer. Due to the low leakage characteristics of the transistor with the metal oxide active layer in the off state.
  • the anti-leakage transistor T8 When the driving transistor T1 drives the organic light-emitting diode OLED to emit light, the anti-leakage transistor T8 is turned off, and the turned-off anti-leakage transistor T8 can suppress the potential change of the control terminal of the driving transistor T1, thereby avoiding the large leakage of the control terminal of the driving transistor T1, which is not conducive to organic light-emitting.
  • the diode realizes the problem of low frequency display.
  • the compensation transistor T3 when the driving transistor T1 drives the organic light-emitting diode OLED to emit light, the compensation transistor T3 is turned off, and the turned-off compensation transistor T3 has low leakage characteristics, which can prevent the current collected through the anode reset transistor T7 to the output end of the driving transistor T1 from leaking through the compensation transistor T3, further. Therefore, the problem of anode shunt of organic light emitting diode OLED can be improved, and the problem of uneven brightness of low gray scale can be improved.
  • FIG. 2B is a driving timing diagram corresponding to the equivalent circuit diagram of the pixel circuit shown in FIG. 2A .
  • the driving method includes the following steps: in the initialization phase t1, the first control signal line Nscan(n) inputs a first control signal of a high level, and the second control signal line Scan(n-1) inputs a second control signal of a low level , the third control signal line Scan(n) inputs a high-level third control signal, and the light-emitting control signal line EM inputs a high-level light-emitting control signal.
  • the driving transistor T1, the switching transistor T2, the first light-emitting control transistor T5 and the second light-emitting control transistor T6 are all turned off, the anti-leakage transistor T8 and the compensation transistor T3 are turned on, the initialization transistor T4 is turned on and the anti-leakage transistor T8 is turned on.
  • the initialization signal input by the initialization signal line Vint is transmitted to the control terminal of the driving transistor T1 to realize the initialization of the control terminal of the driving transistor T1; and the initialization signal is transmitted to the input terminal of the anode reset transistor T7 through the conductive compensation transistor T3, and the anode
  • the reset transistor T7 is turned on and transmits the initialization signal to the anode of the organic light emitting diode OLED, so as to realize the initialization of the organic light emitting diode.
  • the first control signal line Nscan(n) is input with the first control signal of high level
  • the second control signal line Scan(n-1) is input with the second control signal of high level Signal
  • the third control signal line Scan(n) inputs the third control signal of low level
  • the light emission control signal line EM inputs the light emission control signal of high level.
  • the initialization transistor T4, the anode reset transistor T7, the first light-emitting control transistor T5 and the second light-emitting control transistor T6 are all turned off, the compensation transistor T3 and the anti-leakage transistor T8 are turned on and make the control terminal of the driving transistor T1 and the output terminal of the driving transistor T1 Electrically connected, the switching transistor T2 is turned on and the data signal input by the data signal line Data is transmitted to the input end of the driving transistor T1.
  • the first control signal line Nscan(n) inputs the first control signal of low level
  • the second control signal line Scan(n-1) inputs the second control signal of high level
  • the third control signal line Scan(n) inputs a high-level third control signal
  • the light-emitting control signal line EM inputs a low-level light-emitting control signal.
  • the compensation transistor T3, the anti-leakage transistor T8, the initialization transistor T4, the anode reset transistor T7 and the switching transistor T2 are all turned off.
  • the first light-emitting control transistor T5 is turned on and transmits the second power signal to the input end of the driving transistor T1
  • the driving transistor T1 is turned on and outputs the driving current
  • the second light-emitting control transistor T6 is turned on and transmits the driving current to the organic light emitting diode
  • the anode of the OLED, the organic light-emitting diode OLED emits light.
  • FIG. 3A is an equivalent circuit diagram of a pixel circuit of a single pixel according to the second embodiment of the present application.
  • the equivalent circuit diagram shown in FIG. 3A is basically similar to the equivalent circuit diagram shown in FIG. 2A , the difference is that the compensation transistor T3 is a P-type transistor with a polysilicon active layer.
  • the pixel circuit shown in FIG. 3A only has an N-type anti-leakage transistor T8 and a transistor with a metal oxide active layer, a driving transistor T1, a switching transistor T2, a compensation transistor T3, an initialization transistor T4,
  • the first light-emitting control transistor T5, the second light-emitting control transistor T6, and the anode reset transistor T7 are all P-type transistors with a low-temperature polysilicon active layer, because the manufacturing process of the P-type low-temperature polysilicon transistor is simpler than that of the N-type metal oxide transistor. , which is beneficial to reduce the process difficulty of the pixel circuit and improve the product yield.
  • control terminal of the compensation transistor T3 is connected to the third control signal line Scan(n), which is used to make the control terminal of the driving transistor T1 and the driving transistor T8 through the conductive anti-leakage transistor T8 according to the third control signal input from the third control signal line.
  • the output terminal of the transistor T1 is electrically connected.
  • FIG. 3B is a driving timing diagram corresponding to the equivalent circuit diagram of the pixel circuit shown in FIG. 3A .
  • the third control signal line Scan(n) inputs a third control signal with a high level, the compensation transistor T3 is turned off, and the switching transistor T2 is turned off; the second control signal line Scan(n-1) inputs a low level third control signal.
  • the initialization transistor T4 is turned on, and the anode reset transistor T7 is turned on; the first control signal line Nscan(n) inputs a high-level first control signal, and the leakage prevention transistor T8 is turned on; the light-emitting control signal line EM is input With a high-level light-emitting control signal, both the first light-emitting control transistor T5 and the second light-emitting control transistor T6 are turned off.
  • the turned-on initialization transistor T4 transmits the initialization signal input from the initialization signal line Vint to the control terminal of the driving transistor T1 through the turned-on anti-leakage transistor T8 to initialize the control terminal of the driving transistor T1.
  • the third control signal line Scan(n) inputs the third control signal of low level, and the compensation transistor T3 is turned on;
  • the second control signal line Scan(n-1) inputs the second control signal of low level signal, the initialization transistor T4 and the anode reset transistor T7 are turned on.
  • a high-level light-emitting control signal is input to the light-emitting control signal line EM, and both the first light-emitting control transistor T5 and the second light-emitting control transistor T6 are turned off.
  • the turned-on initialization transistor T4 transmits the reset signal input from the initialization signal line Vint to the anode of the organic light emitting diode OLED through the turned-on compensation transistor T3 and the turned-on anode reset transistor T7, so as to reset the anode of the organic light emitting diode OLED.
  • the third control signal line Scan(n) inputs a low-level third control signal, the compensation transistor T3 is turned on, and the switching transistor T2 is turned on; the second control signal line Scan(n) -1) Input the second control signal of high level, the initialization transistor T4 and the anode reset transistor T7 are turned off; the first control signal line Nscan(n) is input with the first control signal of high level, and the anti-leakage transistor T8 is turned on; A high-level light-emitting control signal is input to the control signal line EM, and the first light-emitting control transistor T5 and the second light-emitting control transistor T6 are turned off.
  • the conductive compensation transistor T3 and the conductive anti-leakage transistor T8 connect the control terminal of the driving transistor T1 to the output terminal of the driving transistor T1, and the conductive switching transistor T2 transmits the data signal input from the data signal line Data to the driving transistor. Input of T1.
  • the third control signal line Scan(n) inputs a high-level third control signal
  • the compensation transistor T3 and the switching transistor T2 are both turned off
  • the second control signal line Scan(n-1) inputs a high-level third control signal
  • the initialization transistor T4 and the anode reset transistor T7 are both turned off
  • the first control signal line Nscan(n) inputs a low-level first control signal
  • the anti-leakage transistor T8 is turned off
  • the light-emitting control signal line EM inputs a low level
  • the first light-emitting control transistor T5 is turned on and transmits the second power signal to the input end of the driving transistor T1, the driving transistor T1 is turned on and outputs the driving current, and the second light-emitting control transistor T6 is turned on and the driving current It is transmitted to the anode of the organic light emitting diode OLED, and the organic light emitting diode OLED emits light.
  • the current leaked through the anode reset transistor T7 during the light-emitting process of the organic light emitting diode OLED is collected to the output end of the driving transistor T1, and at least part of the current collected to the output end of the driving transistor T1 will flow into the output end of the organic light emitting diode OLED.
  • Anode to avoid the problem of uneven brightness in low gray scale display caused by anode shunt of organic light emitting diode OLED.
  • FIG. 4 is an equivalent circuit diagram of a pixel circuit of a single pixel according to the third embodiment of the present application.
  • the equivalent circuit of the pixel circuit shown in FIG. 4 is basically similar to the equivalent circuit diagram of the pixel circuit shown in FIG. 3A, except that the anode reset transistor T7 is an N-type transistor with metal oxide, and the control of the anode reset transistor T7 The terminal is connected to the fourth control signal line Nscan(n-1).
  • the fourth control signal line Nscan(n-1) inputs a fourth control signal, which is different from the first control signal, the second control signal, the third control signal and the lighting control signal.
  • the anode reset transistor T7 is an N-type transistor with metal oxide, the anode reset transistor T7 has low leakage characteristics in the off state, avoiding the shunting of the anode of the organic light emitting diode OLED through the anode reset transistor T7, and improving the low gray-scale brightness display. average problem.
  • the driving timing of the equivalent circuit of the pixel circuit shown in FIG. 4 is basically similar to the driving timing shown in FIG. 3B, the difference is that in the initialization stage t1, the fourth control signal line Nscan(n-1) inputs the first low level Four control signals, the anode reset transistor T7 is turned off; in the anode reset stage t2, the fourth control signal line Nscan(n-1) inputs a fourth control signal with a high level, and the anode reset transistor T7 is turned on; in the threshold voltage compensation and data During the signal writing phase t3 and the light-emitting phase t4, the fourth control signal line Nscan(n-1) is input with a fourth control signal of low level, and the anode reset transistor T7 is turned off.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of El Displays (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

一种像素电路及其驱动方法、显示装置，通过阳极复位晶体管(T7)的输入端与驱动晶体管(T1)的输出端连接且阳极复位晶体管(T7)的输出端与有机发光二极管(OLED)的阳极连接，使有机发光二极管(OLED)处于发光状态时有机发光二极管(OLED)的阳极通过阳极复位晶体管(T7)漏的电流合集至驱动晶体管(T1)的输出端，合集至驱动晶体管(T1)输出端的电流部分传输至有机发光二极管(OLED)的阳极。

Description

像素电路及其驱动方法、显示装置 技术领域
本申请涉及显示技术领域，尤其涉及一种像素电路及其驱动方法、显示装置。
 背景技术
请参阅图1，其为传统单个像素的像素电路的等效电路图。单个像素的像素电路包括驱动晶体管T1、开关晶体管T2、补偿晶体管T3、初始化晶体管T4、第一发光控制晶体管T5、第二发光控制晶体管T6、阳极复位晶体管T7、存储电容器C以及有机发光二极管OLED。驱动晶体管T1的控制端与存储电容器C的第一端、补偿晶体管T3的第一端以及初始化晶体管T4的第一端连接，驱动晶体管T1的第一端通过第一发光控制晶体管T5连接至第一电源电压端ELVDD，驱动晶体管T1的第二端通过第二发光控制晶体管T6连接至有机发光二极管OLED的阳极。开关晶体管T2的第一端连接数据信号端Data，开关晶体管T2的第二端连接驱动晶体管T1的第一端，开关晶体管T2的控制端连接第n扫描信号端Scan(n)，n为大于或等于2的整数。补偿晶体管T3的控制端连接第n扫描信号端Scan(n)，补偿晶体管T3的第一端与驱动晶体管T1的控制端连接，补偿晶体管T3的第二端与驱动晶体管T1的第二端连接。初始化晶体管T4的控制端与第n-1扫描驱信号端Scan(n-1)连接，初始化晶体管T4的第一端与驱动晶体管T1的控制端连接，初始化晶体管T4的第二端与初始化信号端Vint连接。第一发光控制晶体管T5的控制端和第二发光控制晶体管T6的控制端均与发光控制信号端EM连接。阳极复位晶体管T7的控制端与第n扫描信号端Scan(n)连接，阳极复位晶体管T7的第一端与有机发光二极管OLED的阳极连接，阳极复位晶体管T7的第二端与初始化信号端Vint连接。有机发光二极管OLED的阴极与第二电源电压端ELVSS连接。其中，驱动晶体管T1、开关晶体管T2、补偿晶体管T3、初始化晶体管T4、第一发光控制晶体管T5、第二发光控制晶体管T6以及阳极复位晶体管T7均为P型且具有低温多晶硅有源层的薄膜晶体管，低温多晶硅薄膜晶体管存在一个致命弱点就是漏电流较大。在有机发光二极管OLED发光以显示低灰阶时，有机发光二极管OLED的阳极通过关闭的阳极复位晶体管T7分流会出现低灰阶显示亮度不均问题。
因此，有必要提出一种技术方案以解决有机发光二极管OLED显示时通过关闭的阳极复位晶体管T7分流导致低灰阶显示亮度不均的问题。
 技术问题
本申请的目的在于提供一种像素电路及其驱动方法、显示装置，以改善有机发光二极管发光显示低灰阶由于阳极分流导致的亮度不均问题。
 技术解决方案
为实现上述目的，本申请提供一种像素电路，所述像素电路包括：
有机发光二极管；驱动晶体管，所述驱动晶体管的输出端与所述有机发光二极管的阳极电连接；补偿晶体管，所述补偿晶体管的第一端与所述驱动晶体管的输出端连接，所述补偿晶体管的第二端与所述驱动晶体管的控制端电连接；初始化晶体管，所述初始化晶体管的输入端与初始化信号线连接，所述初始化晶体管的输出端与所述补偿晶体管的第二端连接，且所述初始化晶体管的输出端与所述驱动晶体管的控制端电连接；以及阳极复位晶体管，所述阳极复位晶体管的输入端与所述驱动晶体管的输出端以及补偿晶体管的第一端连接，所述阳极复位晶体管的输出端与所述有机发光二极管的阳极连接。
在上述像素电路中，所述像素电路还包括防漏电晶体管，所述防漏电晶体管连接于所述补偿晶体管的第二端和所述驱动晶体管的控制端之间，且所述防漏电晶体管连接于所述初始化晶体管的输出端和所述驱动晶体管的控制端之间，其中，所述防漏电晶体管、所述初始化晶体管以及所述补偿晶体管中的至少一者为具有金属氧化物有源层的晶体管。
在上述像素电路中，所述防漏电晶体管和所述补偿晶体管均为N型且具有金属氧化有源层的晶体管。
在上述像素电路中，所述防漏电晶体管的控制端和所述补偿晶体管的控制端均与第一控制信号线连接。
在上述像素电路中，所述防漏电晶体管为N型且具有金属氧化物有源层的晶体管，所述补偿晶体管为P型且具有多晶硅有源层的晶体管。
在上述像素电路中，所述阳极复位晶体管为N型且具有金属氧化物有源层的晶体管。
在上述像素电路中，所述阳极复位晶体管和所述初始化晶体管均为P型且具有多晶硅有源层的晶体管，所述初始化晶体管的控制端和所述阳极复位晶体管的控制端均与第二控制信号线连接。
在上述像素电路中，所述像素电路还包括：开关晶体管，所述开关晶体管的输入端与数据信号线连接，所述开关晶体管的输出端与所述驱动晶体管的输入端连接；第一发光控制晶体管，所述第一发光控制晶体管的输入端与电源信号线连接，所述第一发光控制晶体管的输出端与所述驱动晶体管的输入端连接；第二发光控制晶体管，所述第二发光控制晶体管的输入端与所述驱动晶体管的输出端、所述补偿晶体管的第一端以及所述阳极复位晶体管的输入端连接，所述第二发光控制晶体管的输出端与所述有机发光二极管的阳极连接；电容器，所述电容器的第一端与所述电源信号线连接，所述电容器的第二端与所述驱动晶体管的控制端连接。
在上述像素电路中，所述驱动晶体管、所述开关晶体管、所述第一发光控制晶体管以及所述第二发光控制晶体管均为P型且具有多晶硅有源层的晶体管。
一种上述像素电路的驱动方法，所述方法包括如下步骤：在阳极复位阶段，所述驱动晶体管关闭，所述补偿晶体管导通，所述初始化晶体管导通且将所述初始化信号线输入的复位信号经导通的所述补偿晶体管传输至所述阳极复位晶体管的输入端，且导通的所述阳极复位晶体管将所述复位信号输出至所述有机发光二极管的阳极；在发光阶段，所述阳极复位晶体管关闭，所述补偿晶体管关闭，所述初始化晶体管关闭，所述驱动晶体管导通且向所述有机发光二极管的阳极输出驱动电流。
一种显示装置，所述显示装置包括像素电路，所述像素电路包括：
有机发光二极管；驱动晶体管，所述驱动晶体管的输出端与所述有机发光二极管的阳极电连接；补偿晶体管，所述补偿晶体管的第一端与所述驱动晶体管的输出端连接，所述补偿晶体管的第二端与所述驱动晶体管的控制端电连接；初始化晶体管，所述初始化晶体管的输入端与初始化信号线连接，所述初始化晶体管的输出端与所述补偿晶体管的第二端连接，且所述初始化晶体管的输出端与所述驱动晶体管的控制端电连接；以及阳极复位晶体管，所述阳极复位晶体管的输入端与所述驱动晶体管的输出端以及补偿晶体管的第一端连接，所述阳极复位晶体管的输出端与所述有机发光二极管的阳极连接。
在上述的显示装置中，所述像素电路还包括防漏电晶体管，所述防漏电晶体管连接于所述补偿晶体管的第二端和所述驱动晶体管的控制端之间，且所述防漏电晶体管连接于所述初始化晶体管的输出端和所述驱动晶体管的控制端之间，其中，所述防漏电晶体管、所述初始化晶体管以及所述补偿晶体管中的至少一者为具有金属氧化物有源层的晶体管。
在上述的显示装置中，所述防漏电晶体管和所述补偿晶体管均为N型且具有金属氧化有源层的晶体管。
在上述的显示装置中，所述防漏电晶体管的控制端和所述补偿晶体管的控制端均与第一控制信号线连接。
在上述的显示装置中，所述防漏电晶体管为N型且具有金属氧化物有源层的晶体管，所述补偿晶体管为P型且具有多晶硅有源层的晶体管。
在上述的显示装置中，所述阳极复位晶体管为N型且具有金属氧化物有源层的晶体管。
在上述的显示装置中，所述阳极复位晶体管和所述初始化晶体管均为P型且具有多晶硅有源层的晶体管，所述初始化晶体管的控制端和所述阳极复位晶体管的控制端均与第二控制信号线连接。
在上述的显示装置中，所述像素电路还包括：开关晶体管，所述开关晶体管的输入端与数据信号线连接，所述开关晶体管的输出端与所述驱动晶体管的输入端连接；第一发光控制晶体管，所述第一发光控制晶体管的输入端与电源信号线连接，所述第一发光控制晶体管的输出端与所述驱动晶体管的输入端连接；第二发光控制晶体管，所述第二发光控制晶体管的输入端与所述驱动晶体管的输出端、所述补偿晶体管的第一端以及所述阳极复位晶体管的输入端连接，所述第二发光控制晶体管的输出端与所述有机发光二极管的阳极连接；电容器，所述电容器的第一端与所述电源信号线连接，所述电容器的第二端与所述驱动晶体管的控制端连接。
在上述的显示装置中，所述驱动晶体管、所述开关晶体管、所述第一发光控制晶体管以及所述第二发光控制晶体管均为P型且具有多晶硅有源层的晶体管。
 有益效果
本申请提供一种像素电路及其驱动方法、显示装置，像素电路包括：有机发光二极管；驱动晶体管，驱动晶体管的输出端与有机发光二极管的阳极电连接；补偿晶体管，补偿晶体管的第一端与驱动晶体管的输出端连接，补偿晶体管的第二端与驱动晶体管的控制端电连接；初始化晶体管，初始化晶体管的输入端与初始化信号线连接，初始化晶体管的输出端与补偿晶体管的第二端连接，且初始化晶体管的输出端与驱动晶体管的控制端电连接；以及阳极复位晶体管，阳极复位晶体管的输入端与驱动晶体管的输出端以及补偿晶体管的第一端连接，阳极复位晶体管的输出端与有机发光二极管的阳极连接。通过阳极复位晶体管的输入端与驱动晶体管的输出端连接且阳极复位晶体管的输出端与有机发光二极管的阳极连接，以使得有机发光二极管处于发光状态时发光二极管的阳极通过阳极复位晶体管漏的电流合集至驱动晶体管的输出端，合集至驱动晶体管的输出端的电流至少部分传输至有机发光二极管的阳极，改善有机发光二极管发光显示低灰阶由于阳极分流导致的亮度不均问题。另外，补偿晶体管以及初始化晶体管连接于阳极复位晶体管和初始化信号线之间，使得初始化信号线输入的复位信号通过导通的补偿晶体管以及初始化晶体管传输至阳极复位晶体管，再通过阳极复位晶体管传输至有机发光二极管的阳极，相对于传统技术，提供一种新的阳极复位路径。
 附图说明
图1为传统单个像素的像素电路的等效电路图；
图2A为本申请第一实施例单个像素的像素电路的等效电路图；
图2B为图2A所示像素电路的等效电路图对应的驱动时序图；
图3A为本申请第二实施例单个像素的像素电路的等效电路图；
图3B为图3A所示像素电路的等效电路图对应的驱动时序图；
图4为本申请第三实施例单个像素的像素电路的等效电路图。
 本发明的实施方式
下面将结合本申请实施例中的附图，对本申请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申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
本申请提供一种显示装置，显示装置包括显示面板以及源极驱动器。显示面板为有机发光二极管显示面板。显示面板包括显示区以及位于显示区外的非显示区。显示面板的显示区设置有多个阵列排布的像素电路，显示面板的显示区还设置有扫描信号线、数据信号线、初始化信号线、电源电压信号线以及发光控制信号线等。源极驱动器与数据信号线电性连接，且向数据信号线输入数据信号。显示面板的非显示区设置有栅极驱动电路（Gate On Array，GOA），栅极驱动电路用于输出栅极控制信号，栅极控制信号包括输入至扫描信号线的扫描信号以及输入至发光控制信号线的发光控制信号。
像素电路包括有机发光二极管、开关晶体管、驱动晶体管、补偿晶体管、初始化晶体管、阳极复位晶体管、第一发光控制晶体管以及第二发光控制晶体管。
有机发光二极管包括阴极、阳极以及位于阴极和阳极之间的有机发光层。有机发光二极管在不同大小的驱动电流的作用下发光以显示不同的灰阶。显示低灰阶时，流过有机发光二极管的电流较小。若流入至有机发光二极管的电流通过有机发光二极管的阳极分流，分流会明显影响有机发光二极管显示低灰阶时的显示效果。
驱动晶体管的控制端与电容器的第二端连接，且与初始化晶体管的输出端以及补偿晶体管的第二端电连接。驱动晶体管的输入端通过第一发光控制晶体管与电源信号线连接。驱动晶体管的输出端通过第二发光控制晶体管与有机发光二极管的阳极电连接。驱动晶体管用于向有机发光二极管提供驱动电流。
开关晶体管的控制端与第三控制信号线连接，开关晶体管的输入端与数据信号线连接，开关晶体管的输出端与驱动晶体管的输入端连接。第三控制信号线为第三扫描信号线，第三控制信号线用于输入来自栅极驱动电路的第三控制信号。开关晶体管用于根据第三控制信号将数据信号线输入的数据信号传输至驱动晶体管的输入端。
补偿晶体管的第一端与驱动晶体管的输出端连接，补偿晶体管的第二端与驱动晶体管的控制端电连接。补偿晶体管用于使驱动晶体管的输出端与驱动晶体管的控制端电连接。
初始化晶体管的输入端与初始化信号线连接，初始化晶体管的输出端与补偿晶体管的第二端连接，且初始化晶体管的输出端与驱动晶体管的控制端电连接。初始化信号线用于输入初始化信号，初始化信号线还可以用于输入复位信号。初始化晶体管用于将初始化信号线输入的初始化信号传输至驱动晶体管的控制端，以实现驱动晶体管的控制端的初始化。初始化晶体管还用于将初始化信号或者复位信号通过导通的补偿晶体管传输至阳极复位晶体管，导通的阳极复位晶体管将初始化信号或复位信号传输至有机发光二极管的阳极，以实现有机发光二极管的阳极的初始化。
阳极复位晶体管的输入端与驱动晶体管的输出端以及补偿晶体管的第一端连接，阳极复位晶体管的输出端与有机发光二极管的阳极连接。阳极复位晶体管的输入端与驱动晶体管的输出端连接，使得有机发光二极管的阳极通过阳极复位晶体管漏的电流合集至驱动晶体管的输出端，合集至驱动晶体管的输出端的电流至少部分还是流入至有机发光二极管。阳极复位晶体管的输入端与补偿晶体管的第一端连接，使得阳极复位晶体管的输入端通过导通的补偿晶体管接收来自初始化晶体管的初始化信号或者复位信号，以实现有机发光二极管的阳极的复位。
像素电路还包括防漏电晶体管，防漏电晶体管连接于补偿晶体管的第二端和驱动晶体管的控制端之间，且防漏电晶体管连接于初始化晶体管的输出端和驱动晶体管的控制端之间，防漏电晶体管、初始化晶体管以及补偿晶体管中的至少一者为具有金属氧化物有源层的晶体管。通过防漏电晶体管、初始化晶体管以及补偿晶体管中的至少一者为具有金属氧化物有源层的晶体管，以降低驱动晶体管的控制端的漏电，避免驱动晶体管驱动有机发光二极管显示时驱动晶体管的控制端漏电严重而不利于低频或超低频显示。
防漏电晶体管和补偿晶体管均为N型且具有金属氧化有源层的晶体管时，防漏电晶体管和补偿晶体管均具有低漏电特性。一方面，防漏电晶体管的低漏电特性在一帧时间内抑制驱动晶体管的控制端的电位变化，且补偿晶体管的低漏电特性进一步地避免驱动晶体管的控制端通过补偿晶体管漏电。另一方面，补偿晶体管的低漏电特性使得通过阳极复位晶体管合集至驱动晶体管的漏电流不会从补偿晶体管漏出，而经过第二发光控制晶体管流入至有机发光二极管，从而进一步地改善有机发光二极管显示低灰阶时亮度不均的问题。
防漏电晶体管的控制端和补偿晶体管的控制端均与第一控制信号线连接，以使得防漏电晶体管和补偿晶体管受控于相同的控制信号从而处于导通或关闭状态。第一控制信号线用于输入栅极驱动电路输入的第一控制信号，第一控制信号线为第一扫描信号线。
防漏电晶体管为N型且具有金属氧化物有源层的晶体管，且补偿晶体管为P型且具有多晶硅有源层的晶体管时，防漏电晶体管起到抑制驱动晶体管的控制端的电位变化的作用。P型多晶硅晶体管制造比N型金属氧化物晶体管的制造简单，补偿晶体管为P型且具有多晶硅有源层的晶体管更有利于降低制程风险，提高产品良率。
阳极复位晶体管为N型且具有金属氧化物有源层的晶体管时，使得阳极复位晶体管具有低漏电特性，避免有机发光二极管的阳极通过关闭的阳极复位晶体管漏电，从而改善有机发光二极管显示低灰阶时的亮度不均问题。
阳极复位晶体管和初始化晶体管均为P型且具有多晶硅有源层的晶体管时，初始化晶体管的控制端和阳极复位晶体管的控制端均与第二控制信号线连接，使得两者受控制于相同的控制信号从而处于导通或关闭状态。第二控制信号线用于输入栅极驱动电路输出的第二控制信号，第二控制信号线为第二扫描信号线。
第一发光控制晶体管的输入端与电源信号线连接，第一发光控制晶体管的输出端与驱动晶体管的输入端连接，第一发光控制晶体管的控制端与发光控制信号线连接。第一发光控制晶体管用于根据发光控制信号线输入的发光控制信号将电源信号线输入的电源信号输出至驱动晶体管的输入端。
第二发光控制晶体管的输入端与驱动晶体管的输出端、补偿晶体管的第一端以及阳极复位晶体管的输入端连接，第二发光控制晶体管的输出端与有机发光二极管的阳极连接，第二发光控制晶体管的控制端与发光控制信号线连接。第二发光控制晶体管用于根据发光控制信号线输入的发光控制信号将驱动晶体管输出的驱动电流传输至有机发光二极管的阳极。
电容器的第一端与电源信号线连接，电容器的第二端与驱动晶体管的控制端连接。电容器用于维持驱动晶体管驱动有机发光二极管发光过程中驱动晶体管的控制端的电位。
驱动晶体管、开关晶体管、第一发光控制晶体管以及第二发光控制晶体管均为P型且具有多晶硅有源层的晶体管，P型晶体管在低电平电压的作用下导通，在高电平电压的作用下关闭。具体地，本申请中具有多晶硅有源层的晶体管均为低温多晶硅晶体管。像素电路包括多晶硅晶体管和金属氧化物晶体管时，有利于降低像素电路工作时的功耗。
以下结合具体实施例对上述方案进行详述。
请参阅图2A，其为本申请第一实施例单个像素的像素电路的等效电路图。像素电路包括有机发光二极管OLED、驱动晶体管T1、开关晶体管T2、补偿晶体管T3、初始化晶体管T4、第一发光控制晶体管T5、第二发光控制晶体管T6、阳极复位晶体管T7、防漏电晶体管T8以及电容器C。
有机发光二极管OLED包括阴极、阳极以及位于阴极和阳极之间的有机发光层。有机发光二极管OLED的阴极与第一电源信号线ELVSS连接。有机发光二极管OLED的阳极与阳极复位晶体管T7的输出端、第二发光控制晶体管T6的输出端连接。
驱动晶体管T1的控制端与防漏电晶体管T8的输出端以及电容器C的第二端连接。驱动晶体管T1的输入端与第一发光控制晶体管T5的输出端以及开关晶体关T2的输出端连接。驱动晶体管T1的输出端与第二发光控制晶体管T6的输入端、补偿晶体管T3的第一端以及阳极复位晶体管T7的输入端连接。驱动晶体管T1用于向有机发光二极管OLED提供驱动电流。
开关晶体管T2的控制端与第三控制信号线Scan(n)连接，开关晶体管T2的输入端与数据信号线Data连接，开关晶体管T2的输出端与驱动晶体管T1的输入端连接。开关晶体管T2用于根据第三控制信号线Scan（n）输入的第三控制信号将数据信号线Data输入的数据信号传输至驱动晶体管T1的输入端。
补偿晶体管T3的控制端与第一控制信号线Nscan(n)连接，补偿晶体管T3的第一端与驱动晶体管T1的输出端连接，补偿晶体管T3的第二端与驱动晶体管T1的控制端电性连接。补偿晶体管T3用于根据第一控制信号线Nscan（n）输入的第一控制信号使驱动晶体管T1的控制端以及驱动晶体管T1的输出端通过导通的防漏电晶体管T8电性连接。
初始化晶体管T4的控制端与第二控制信号线Scan(n-1)连接，初始化晶体管T4的输入端与初始化信号线Vint连接，初始化晶体管T4的输出端与补偿晶体管T3的第二端连接，且初始化晶体管T4的输出端与驱动晶体管T1的控制端电连接。初始化晶体管T4用于根据第二控制信号线Scan(n-1)输入的第二控制信号将初始化信号线Vint输入的初始化信号通过导通的防漏电晶体管T8传输至驱动晶体管T1的控制端，且依次通过导通的补偿晶体管T3以及导通的阳极复位晶体管T7将初始化信号传输至有机发光二极管OLED的阳极，以同时实现驱动晶体管T1的控制端的初始化以及有机发光二极管OLED阳极的初始化。相对于传统技术中有机发光二极管OLED的阳极复位只是通过导通的阳极复位晶体管T7实现，本实施例中有机发光二极管OLED的阳极复位是通过导通的初始化晶体管T4、导通的补偿晶体管T3以及导通的阳极复位晶体管T7实现。
第一发光控制晶体管T5的控制端与发光控制信号线EM连接，第一发光控制晶体管T5的输入端与第二电源信号线ELVDD连接，第一发光控制晶体管T5的输出端与驱动晶体管T1的输入端连接。第一发光控制晶体管T5用于根据发光控制信号线EM输入的发光控制信号将第二电源信号线ELVDD输入的第二电源信号输出至驱动晶体管T1的输入端。
第二发光控制晶体管T6的控制端与发光控制信号线EM连接，第二发光控制晶体管T6的输入端与驱动晶体管T1的输出端、补偿晶体管T3的第一端以及阳极复位晶体管T7的输入端连接，第二发光控制晶体管T6的输出端与有机发光二极管OLED的阳极连接。第二发光控制晶体管T6用于根据发光控制信号线输入的发光控制信号将驱动晶体管T1输出的驱动电流传输至有机发光二极管OLED的阳极。
阳极复位晶体管T7的控制端与第二控制信号线Scan(n-1)连接，阳极复位晶体管T7的输入端与驱动晶体管T1的输出端、补偿晶体管T3的第一端以及第二发光控制晶体管T6的输入端连接，阳极复位晶体管T7的输出端与有机发光二极管OLED的阳极连接。阳极复位晶体管T7用于根据第二控制信号线Scan(n-1)输入的第二控制信号将导通的初始化晶体管T4以及导通的补偿晶体管T3传输的初始化信号传输至有机发光二极管OLED的阳极。有机发光二极管OLED处于关闭状态时，有机发光二极管OLED通过阳极复位晶体管T7漏的电流合集至驱动晶体管T1的输出端，部分合集至驱动晶体管T1的输出端的电流通过导通的第二发光控制晶体管T6流入至有机发光二极管OLED的阳极，改善有机发光二极管OLED的阳极分流导致的低灰阶亮度显示不均的问题。
防漏电晶体管T8的控制端与第一控制信号线Nscan(n)连接，防漏电晶体管T8连接于补偿晶体管T3的第二端和驱动晶体管T1的控制端之间，且防漏电晶体管T8连接于初始化晶体管T4的输出端和驱动晶体管T1的控制端之间。防漏电晶体管T8为具有金属氧化物有源层的晶体管。
电容器C的第一端与第二电源信号线ELVDD连接，电容器C的第二端与驱动晶体管T1的控制端连接。电容器C用于维持驱动晶体管T1的控制端在有机发光二极管OLED在一帧发光过程中的电位。
在本实施例中，驱动晶体管T1、开关晶体管T2、初始化晶体管T4、第一发光控制晶体管T5、第二发光控制晶体管T6以及阳极复位晶体管T7均为P型且具有多晶硅有源层的晶体管。补偿晶体管T3以及防漏电晶体管T8均为N型且具有金属氧化物有源层的晶体管。由于具有金属氧化物有源层的晶体管处于关闭状态时具有低漏电特性。驱动晶体管T1驱动有机发光二极管OLED发光时，防漏电晶体管T8关闭，关闭的防漏电晶体管T8能抑制驱动晶体管T1的控制端的电位变化，从而避免驱动晶体管T1的控制端漏电较大导致不利于有机发光二极管实现低频显示的问题。且驱动晶体管T1驱动有机发光二极管OLED发光时，补偿晶体管T3关闭，关闭的补偿晶体管T3具有低漏电特性，可以抑制通过阳极复位晶体管T7合集至驱动晶体管T1的输出端的电流通过补偿晶体管T3漏出，进一步地改善有机发光二极管OLED的阳极分流的问题，改善低灰阶亮度不均的问题。
请参阅图2B，其为图2A所示像素电路的等效电路图对应的驱动时序图。
驱动方法包括如下步骤：在初始化阶段t1，第一控制信号线Nscan(n)输入高电平的第一控制信号，第二控制信号线Scan(n-1)输入低电平的第二控制信号，第三控制信号线Scan(n)输入高电平的第三控制信号，发光控制信号线EM输入高电平的发光控制信号。驱动晶体管T1、开关晶体关T2、第一发光控制晶体管T5以及第二发光控制晶体管T6均关闭，防漏电晶体管T8以及补偿晶体管T3导通，初始化晶体管T4导通且通过导通的防漏晶体管T8将初始化信号线Vint输入的初始化信号传输至驱动晶体管T1的控制端，以实现驱动晶体管T1的控制端的初始化；且通过导通的补偿晶体管T3将初始化信号传输至阳极复位晶体管T7的输入端，阳极复位晶体管T7导通且将初始化信号传输至有机发光二极管OLED的阳极，以实现有机发光二极管的初始化。
在阈值电压补偿以及数据电压写入阶段t2，第一控制信号线Nscan(n)输入高电平的第一控制信号，第二控制信号线Scan(n-1)输入高电平的第二控制信号，第三控制信号线Scan(n)输入低电平的第三控制信号，发光控制信号线EM输入高电平的发光控制信号。初始化晶体管T4、阳极复位晶体管T7、第一发光控制晶体管T5以及第二发光控制晶体管T6均关闭，补偿晶体管T3以及防漏电晶体管T8导通且使得驱动晶体管T1的控制端与驱动晶体管T1的输出端电性连接，开关晶体管T2导通且使得数据信号线Data输入的数据信号传输至驱动晶体管T1的输入端。
在发光阶段t3，第一控制信号线Nscan(n)输入低电平的第一控制信号，第二控制信号线Scan(n-1)输入高电平的第二控制信号，第三控制信号线Scan(n)输入高电平的第三控制信号，发光控制信号线EM输入低电平的发光控制信号。补偿晶体管T3、防漏电晶体管T8、初始化晶体管T4、阳极复位晶体管T7以及开关晶体管T2均关闭。第一发光控制晶体管T5导通且将第二电源信号传输至驱动晶体管T1的输入端，驱动晶体管T1导通且输出驱动电流，第二发光控制晶体管T6导通且将驱动电流传输至有机发光二极管OLED的阳极，有机发光二极管OLED发光。
请参阅图3A，其为本申请第二实施例单个像素的像素电路的等效电路图。图3A所示等效电路图与图2A所示等效电路图基本相似，不同之处在于，补偿晶体管T3为P型且具有多晶硅有源层的晶体管。
相对于图2A所示像素电路，图3A所示像素电路只有防漏电晶体管T8为N型且具有金属氧化物有源层的晶体管，驱动晶体管T1、开关晶体管T2、补偿晶体管T3、初始化晶体管T4、第一发光控制晶体管T5、第二发光控制晶体管T6以及阳极复位晶体管T7均为P型且具有低温多晶硅有源层的晶体管，由于P型低温多晶硅晶体管的制程比N型金属氧化物晶体管的制程简单，有利于降低像素电路的制程难度，提高产品良率。且补偿晶体管T3的控制端与第三控制信号线Scan(n)连接，用于根据第三控制信号线输入的第三控制信号通过导通的防漏电晶体管T8使驱动晶体管T1的控制端和驱动晶体管T1的输出端电连接。
请参阅图3B，其为图3A所示像素电路的等效电路图对应的驱动时序图。
在初始化阶段t1，第三控制信号线Scan(n)输入高电平的第三控制信号，补偿晶体管T3关闭，开关晶体管T2关闭；第二控制信号线Scan(n-1)输入低电平的第二控制信号，初始化晶体管T4导通，阳极复位晶体管T7导通；第一控制信号线Nscan(n)输入高电平的第一控制信号，防漏电晶体管T8导通；发光控制信号线EM输入高电平的发光控制信号，第一发光控制晶体管T5和第二发光控制晶体管T6均关闭。导通的初始化晶体管T4将初始化信号线Vint输入的初始化信号通过导通的防漏电晶体管T8传输至驱动晶体管T1的控制端，以实现驱动晶体管T1的控制端的初始化。
在阳极复位阶段t2，第三控制信号线Scan(n)输入低电平的第三控制信号，补偿晶体管T3导通；第二控制信号线Scan(n-1)输入低电平的第二控制信号，初始化晶体管T4和阳极复位晶体管T7导通。发光控制信号线EM输入高电平的发光控制信号，第一发光控制晶体管T5和第二发光控制晶体管T6均关闭。导通的初始化晶体管T4将初始化信号线Vint输入的复位信号经过导通的补偿晶体管T3以及导通的阳极复位晶体管T7传输至有机发光二极管OLED的阳极，以实现有机发光二极管OLED的阳极的复位。
在阈值电压补偿以及数据写入阶段t3，第三控制信号线Scan(n)输入低电平的第三控制信号，补偿晶体管T3导通，开关晶体管T2导通；第二控制信号线Scan（n-1）输入高电平的第二控制信号，初始化晶体管T4以及阳极复位晶体管T7关闭；第一控制信号线Nscan(n)输入高电平的第一控制信号，防漏电晶体管T8导通；发光控制信号线EM输入高电平的发光控制信号，第一发光控制晶体管T5和第二发光控制晶体管T6关闭。导通的补偿晶体管T3和导通的防漏电晶体管T8使得驱动晶体管T1的控制端和驱动晶体管T1的输出端连接，且导通的开关晶体管T2将数据信号线Data输入的数据信号传输至驱动晶体管T1的输入端。
在发光阶段t4，第三控制信号线Scan(n)输入高电平的第三控制信号，补偿晶体管T3以及开关晶体管T2均关闭；第二控制信号线Scan(n-1)输入高电平的第二控制信号，初始化晶体管T4以及阳极复位晶体管T7均关闭；第一控制信号线Nscan(n)输入低电平的第一控制信号，防漏电晶体管T8关闭；发光控制信号线EM输入低电平的发光控制信号，第一发光控制晶体管T5导通且将第二电源信号传输至驱动晶体管T1的输入端，驱动晶体管T1导通且输出驱动电流，第二发光控制晶体管T6导通且将驱动电流传输至有机发光二极管OLED的阳极，有机发光二极管OLED发光。
在本实施例中，有机发光二极管OLED发光过程中通过阳极复位晶体管T7漏的电流会合集至驱动晶体管T1的输出端，至少部分合集至驱动晶体管T1的输出端的电流会流入至有机发光二极管OLED的阳极，避免有机发光二极管OLED的阳极分流导致低灰阶显示时出现亮度不均的问题。
请参阅图4，其为本申请第三实施例单个像素的像素电路的等效电路图。图4所示像素电路的等效电路与图3A所示像素电路的等效电路图基本相似，不同之处在于，阳极复位晶体管T7为N型且具有金属氧化物的晶体管，阳极复位晶体管T7的控制端与第四控制信号线Nscan(n-1)连接。第四控制信号线Nscan(n-1）输入第四控制信号，第四控制信号不同于第一控制信号、第二控制信号、第三控制信号以及发光控制信号。由于阳极复位晶体管T7为N型且具有金属氧化物的晶体管，使得阳极复位晶体管T7在关闭状态具有低漏电特性，避免有机发光二极管OLED的阳极通过阳极复位晶体管T7分流，改善低灰阶亮度显示不均问题。
图4所示像素电路的等效电路的驱动时序与图3B所示驱动时序基本相似，不同之处在于，在初始化阶段t1，第四控制信号线Nscan(n-1)输入低电平的第四控制信号，阳极复位晶体管T7关闭；在阳极复位阶段t2，第四控制信号线Nscan(n-1)输入高电平的第四控制信号，阳极复位晶体管T7导通；在阈值电压补偿和数据信号写入阶段t3以及发光阶段t4，第四控制信号线Nscan(n-1)输入低电平的第四控制信号，阳极复位晶体管T7关闭。
以上实施例的说明只是用于帮助理解本申请的技术方案及其核心思想；本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例的技术方案的范围。

Claims (19)

  1. 一种像素电路，其中，所述像素电路包括：
    有机发光二极管；
    驱动晶体管，所述驱动晶体管的输出端与所述有机发光二极管的阳极电连接；
    补偿晶体管，所述补偿晶体管的第一端与所述驱动晶体管的输出端连接，所述补偿晶体管的第二端与所述驱动晶体管的控制端电连接；
    初始化晶体管，所述初始化晶体管的输入端与初始化信号线连接，所述初始化晶体管的输出端与所述补偿晶体管的第二端连接，且所述初始化晶体管的输出端与所述驱动晶体管的控制端电连接；以及
    阳极复位晶体管，所述阳极复位晶体管的输入端与所述驱动晶体管的输出端以及补偿晶体管的第一端连接，所述阳极复位晶体管的输出端与所述有机发光二极管的阳极连接。
  2. 根据权利要求1所述的像素电路，其中，所述像素电路还包括防漏电晶体管，所述防漏电晶体管连接于所述补偿晶体管的第二端和所述驱动晶体管的控制端之间，且所述防漏电晶体管连接于所述初始化晶体管的输出端和所述驱动晶体管的控制端之间，
    其中，所述防漏电晶体管、所述初始化晶体管以及所述补偿晶体管中的至少一者为具有金属氧化物有源层的晶体管。
  3. 根据权利要求2所述的像素电路，其中，所述防漏电晶体管和所述补偿晶体管均为N型且具有金属氧化有源层的晶体管。
  4. 根据权利要求3所述的像素电路，其中，所述防漏电晶体管的控制端和所述补偿晶体管的控制端均与第一控制信号线连接。
  5. 根据权利要求2所述的像素电路，其中，所述防漏电晶体管为N型且具有金属氧化物有源层的晶体管，所述补偿晶体管为P型且具有多晶硅有源层的晶体管。
  6. 根据权利要求1所述的像素电路，其中，所述阳极复位晶体管为N型且具有金属氧化物有源层的晶体管。
  7. 根据权利要求1所述的像素电路，其中，所述阳极复位晶体管和所述初始化晶体管均为P型且具有多晶硅有源层的晶体管，所述初始化晶体管的控制端和所述阳极复位晶体管的控制端均与第二控制信号线连接。
  8. 根据权利要求1所述的像素电路，其中，所述像素电路还包括：
    开关晶体管，所述开关晶体管的输入端与数据信号线连接，所述开关晶体管的输出端与所述驱动晶体管的输入端连接；
    第一发光控制晶体管，所述第一发光控制晶体管的输入端与电源信号线连接，所述第一发光控制晶体管的输出端与所述驱动晶体管的输入端连接；
    第二发光控制晶体管，所述第二发光控制晶体管的输入端与所述驱动晶体管的输出端、所述补偿晶体管的第一端以及所述阳极复位晶体管的输入端连接，所述第二发光控制晶体管的输出端与所述有机发光二极管的阳极连接；
    电容器，所述电容器的第一端与所述电源信号线连接，所述电容器的第二端与所述驱动晶体管的控制端连接。
  9. 根据权利要求8所述的像素电路，其中，所述驱动晶体管、所述开关晶体管、所述第一发光控制晶体管以及所述第二发光控制晶体管均为P型且具有多晶硅有源层的晶体管。
  10. 一种如权利要求1所述像素电路的驱动方法，其中，所述方法包括如下步骤：
    在阳极复位阶段，所述驱动晶体管关闭，所述补偿晶体管导通，所述初始化晶体管导通且将所述初始化信号线输入的复位信号经导通的所述补偿晶体管传输至所述阳极复位晶体管的输入端，且导通的所述阳极复位晶体管将所述复位信号输出至所述有机发光二极管的阳极；
    在发光阶段，所述阳极复位晶体管关闭，所述补偿晶体管关闭，所述初始化晶体管关闭，所述驱动晶体管导通且向所述有机发光二极管的阳极输出驱动电流。
  11. 一种显示装置，其中，所述显示装置包括像素电路，所述像素电路包括：
    有机发光二极管；
    驱动晶体管，所述驱动晶体管的输出端与所述有机发光二极管的阳极电连接；
    补偿晶体管，所述补偿晶体管的第一端与所述驱动晶体管的输出端连接，所述补偿晶体管的第二端与所述驱动晶体管的控制端电连接；
    初始化晶体管，所述初始化晶体管的输入端与初始化信号线连接，所述初始化晶体管的输出端与所述补偿晶体管的第二端连接，且所述初始化晶体管的输出端与所述驱动晶体管的控制端电连接；以及
    阳极复位晶体管，所述阳极复位晶体管的输入端与所述驱动晶体管的输出端以及补偿晶体管的第一端连接，所述阳极复位晶体管的输出端与所述有机发光二极管的阳极连接。
  12. 根据权利要求11所述的显示装置，其中，所述像素电路还包括防漏电晶体管，所述防漏电晶体管连接于所述补偿晶体管的第二端和所述驱动晶体管的控制端之间，且所述防漏电晶体管连接于所述初始化晶体管的输出端和所述驱动晶体管的控制端之间，
    其中，所述防漏电晶体管、所述初始化晶体管以及所述补偿晶体管中的至少一者为具有金属氧化物有源层的晶体管。
  13. 根据权利要求12所述的显示装置，其中，所述防漏电晶体管和所述补偿晶体管均为N型且具有金属氧化有源层的晶体管。
  14. 根据权利要求13所述的显示装置，其中，所述防漏电晶体管的控制端和所述补偿晶体管的控制端均与第一控制信号线连接。
  15. 根据权利要求12所述的显示装置，其中，所述防漏电晶体管为N型且具有金属氧化物有源层的晶体管，所述补偿晶体管为P型且具有多晶硅有源层的晶体管。
  16. 根据权利要求11所述的显示装置，其中，所述阳极复位晶体管为N型且具有金属氧化物有源层的晶体管。
  17. 根据权利要求11所述的显示装置，其中，所述阳极复位晶体管和所述初始化晶体管均为P型且具有多晶硅有源层的晶体管，所述初始化晶体管的控制端和所述阳极复位晶体管的控制端均与第二控制信号线连接。
  18. 根据权利要求11所述的显示装置，其中，所述像素电路还包括：
    开关晶体管，所述开关晶体管的输入端与数据信号线连接，所述开关晶体管的输出端与所述驱动晶体管的输入端连接；
    第一发光控制晶体管，所述第一发光控制晶体管的输入端与电源信号线连接，所述第一发光控制晶体管的输出端与所述驱动晶体管的输入端连接；
    第二发光控制晶体管，所述第二发光控制晶体管的输入端与所述驱动晶体管的输出端、所述补偿晶体管的第一端以及所述阳极复位晶体管的输入端连接，所述第二发光控制晶体管的输出端与所述有机发光二极管的阳极连接；以及
    电容器，所述电容器的第一端与所述电源信号线连接，所述电容器的第二端与所述驱动晶体管的控制端连接。
  19. 根据权利要求18所述的显示装置，其中，所述驱动晶体管、所述开关晶体管、所述第一发光控制晶体管以及所述第二发光控制晶体管均为P型且具有多晶硅有源层的晶体管。
PCT/CN2020/130838 2020-07-24 2020-11-23 像素电路及其驱动方法、显示装置 Ceased WO2022016760A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US17/266,999 US11929023B2 (en) 2020-07-24 2020-11-23 Pixel circuit, method of driving same, and display device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202010724831.9 2020-07-24
CN202010724831.9A CN111754938B (zh) 2020-07-24 2020-07-24 像素电路及其驱动方法、显示装置

Publications (1)

Publication Number Publication Date
WO2022016760A1 true WO2022016760A1 (zh) 2022-01-27

Family

ID=72711817

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2020/130838 Ceased WO2022016760A1 (zh) 2020-07-24 2020-11-23 像素电路及其驱动方法、显示装置

Country Status (3)

Country Link
US (1) US11929023B2 (zh)
CN (1) CN111754938B (zh)
WO (1) WO2022016760A1 (zh)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111724745B (zh) 2020-07-15 2023-11-28 武汉华星光电半导体显示技术有限公司 像素电路及其驱动方法、显示装置
CN111754938B (zh) * 2020-07-24 2023-11-28 武汉华星光电半导体显示技术有限公司 像素电路及其驱动方法、显示装置
WO2022110220A1 (zh) 2020-11-30 2022-06-02 京东方科技集团股份有限公司 像素电路、其驱动方法及显示装置
CN112562588A (zh) * 2020-12-24 2021-03-26 武汉华星光电半导体显示技术有限公司 像素驱动电路及显示面板
CN112909054A (zh) * 2021-01-26 2021-06-04 武汉华星光电半导体显示技术有限公司 像素驱动电路及显示面板
GB2615936A (en) * 2021-04-23 2023-08-23 Boe Technology Group Co Ltd Pixel circuit and driving method therefor, and display device
KR102810639B1 (ko) * 2021-05-31 2025-05-22 보에 테크놀로지 그룹 컴퍼니 리미티드 디스플레이 기판 및 디스플레이 패널
US12236866B2 (en) * 2021-07-30 2025-02-25 Boe Technology Group Co., Ltd. Pixel circuit, driving method and display device
EP4300474A4 (en) 2021-07-30 2024-02-28 BOE Technology Group Co., Ltd. PIXEL CIRCUIT, CONTROL METHOD AND DISPLAY DEVICE
US12300165B2 (en) 2021-08-20 2025-05-13 Boe Technology Group Co., Ltd. Pixel circuit and drive method therefor, and display apparatus
CN119894097A (zh) * 2021-09-14 2025-04-25 厦门天马显示科技有限公司 显示面板及显示装置
CN116965176A (zh) * 2022-02-22 2023-10-27 京东方科技集团股份有限公司 显示基板及其制备方法、显示装置
CN118140264A (zh) * 2022-09-30 2024-06-04 京东方科技集团股份有限公司 像素电路、驱动方法、显示面板及显示装置
CN115938275A (zh) * 2022-11-23 2023-04-07 武汉华星光电半导体显示技术有限公司 像素电路及显示面板
KR102848000B1 (ko) 2022-11-23 2025-08-20 우한 차이나 스타 옵토일렉트로닉스 세미컨덕터 디스플레이 테크놀로지 컴퍼니 리미티드 픽셀 회로 및 디스플레이 패널
CN117812936B (zh) * 2023-12-28 2024-10-11 惠科股份有限公司 有机发光显示面板及其驱动方法、显示装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1677469A (zh) * 2004-03-29 2005-10-05 东北先锋电子股份有限公司 发光显示面板的驱动装置及安装该驱动装置的电子设备
US20080169754A1 (en) * 2007-01-15 2008-07-17 Yang Sun A Organic electroluminescent display
CN101630481A (zh) * 2008-07-18 2010-01-20 三星移动显示器株式会社 像素和使用所述像素的有机发光显示装置
CN104021762A (zh) * 2014-05-30 2014-09-03 京东方科技集团股份有限公司 一种像素电路及其驱动方法、显示装置
CN104464643A (zh) * 2014-12-29 2015-03-25 上海和辉光电有限公司 显示装置、像素驱动电路及其驱动方法
CN104658470A (zh) * 2013-11-22 2015-05-27 上海和辉光电有限公司 Oled像素电路
US20150294618A1 (en) * 2014-04-09 2015-10-15 Samsung Display Co., Ltd. Organic light-emitting display
CN111754938A (zh) * 2020-07-24 2020-10-09 武汉华星光电半导体显示技术有限公司 像素电路及其驱动方法、显示装置

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4460822B2 (ja) * 2002-11-29 2010-05-12 東芝モバイルディスプレイ株式会社 双方向シフトレジスタ、これを用いた駆動回路、平面表示装置
CN103208263B (zh) * 2013-03-14 2015-03-04 京东方科技集团股份有限公司 移位寄存器、显示装置、栅极驱动电路及驱动方法
CN103971638B (zh) * 2014-05-04 2016-03-16 京东方科技集团股份有限公司 像素驱动电路、驱动方法、阵列基板及显示装置
CN105206221B (zh) * 2014-06-13 2018-06-22 京东方科技集团股份有限公司 像素驱动电路、驱动方法、阵列基板及显示装置
CN104751779A (zh) * 2014-11-25 2015-07-01 上海和辉光电有限公司 显示装置、oled像素驱动电路及其驱动方法
CN104658484B (zh) * 2015-03-18 2018-01-16 上海和辉光电有限公司 显示装置、像素驱动电路及其驱动方法
CN104680980B (zh) * 2015-03-25 2017-02-15 京东方科技集团股份有限公司 像素驱动电路及其驱动方法、显示装置
CN106710516A (zh) * 2015-08-26 2017-05-24 上海和辉光电有限公司 显示装置、像素驱动电路及其驱动方法
CN107452339B (zh) * 2017-07-31 2019-08-09 上海天马有机发光显示技术有限公司 像素电路、其驱动方法、有机发光显示面板及显示装置
CN107591124B (zh) * 2017-09-29 2019-10-01 上海天马微电子有限公司 像素补偿电路、有机发光显示面板及有机发光显示装置
CN107610651B (zh) * 2017-10-31 2019-11-08 武汉天马微电子有限公司 像素电路、像素电路的驱动方法和显示面板
CN208141796U (zh) * 2018-04-28 2018-11-23 京东方科技集团股份有限公司 移位寄存器单元、栅极驱动电路及显示装置
CN212276788U (zh) * 2020-07-24 2021-01-01 武汉华星光电半导体显示技术有限公司 像素电路及显示装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1677469A (zh) * 2004-03-29 2005-10-05 东北先锋电子股份有限公司 发光显示面板的驱动装置及安装该驱动装置的电子设备
US20080169754A1 (en) * 2007-01-15 2008-07-17 Yang Sun A Organic electroluminescent display
CN101630481A (zh) * 2008-07-18 2010-01-20 三星移动显示器株式会社 像素和使用所述像素的有机发光显示装置
CN104658470A (zh) * 2013-11-22 2015-05-27 上海和辉光电有限公司 Oled像素电路
US20150294618A1 (en) * 2014-04-09 2015-10-15 Samsung Display Co., Ltd. Organic light-emitting display
CN104021762A (zh) * 2014-05-30 2014-09-03 京东方科技集团股份有限公司 一种像素电路及其驱动方法、显示装置
CN104464643A (zh) * 2014-12-29 2015-03-25 上海和辉光电有限公司 显示装置、像素驱动电路及其驱动方法
CN111754938A (zh) * 2020-07-24 2020-10-09 武汉华星光电半导体显示技术有限公司 像素电路及其驱动方法、显示装置

Also Published As

Publication number Publication date
CN111754938A (zh) 2020-10-09
US11929023B2 (en) 2024-03-12
US20220358879A1 (en) 2022-11-10
CN111754938B (zh) 2023-11-28

Similar Documents

Publication Publication Date Title
WO2022016760A1 (zh) 像素电路及其驱动方法、显示装置
CN111724745B (zh) 像素电路及其驱动方法、显示装置
CN111477166B (zh) 像素电路、像素驱动方法和显示装置
US9589505B2 (en) OLED pixel circuit, driving method of the same, and display device
CN212276788U (zh) 像素电路及显示装置
CN112489599B (zh) Amoled像素驱动电路、驱动方法及显示面板
WO2018218742A1 (zh) 像素驱动电路及其修复方法与显示装置
CN112102778A (zh) 像素电路及其驱动方法、显示基板和显示装置
WO2019214397A1 (zh) 像素驱动电路及驱动方法、显示装置
CN114814413B (zh) 显示面板及显示面板的老化测试方法
CN106067291A (zh) 一种像素驱动电路及其驱动方法、显示装置
CN110992891B (zh) 一种像素驱动电路、驱动方法和显示基板
WO2022188191A1 (zh) 发光器件驱动电路、背光模组以及显示面板
WO2019085485A1 (zh) 一种像素电路及其驱动方法、显示装置
WO2021232741A1 (zh) 像素驱动电路和 oled 显示面板
US20210358401A1 (en) Pixel unit and display panel
WO2022016722A1 (zh) 像素电路及其驱动方法
CN114999391A (zh) 像素电路和显示面板
WO2024216905A1 (zh) 像素驱动电路和显示面板
US20210241687A1 (en) Pixel compensation circuit, driving method, and display device
WO2023226083A1 (zh) 像素驱动电路、像素驱动方法和显示面板
US11211005B2 (en) Pixel driving circuit, display device and driving method
KR20210092306A (ko) 픽셀 회로, 디스플레이 장치 및 픽셀 회로의 구동 방법
CN116524862A (zh) 像素电路及其驱动方法、显示面板
CN114120874B (zh) 发光器件驱动电路、背光模组以及显示面板

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20946524

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20946524

Country of ref document: EP

Kind code of ref document: A1