WO2019095451A1 - Amoled像素驱动电路及其驱动方法 - Google Patents

Amoled像素驱动电路及其驱动方法 Download PDF

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Publication number
WO2019095451A1
WO2019095451A1 PCT/CN2017/114495 CN2017114495W WO2019095451A1 WO 2019095451 A1 WO2019095451 A1 WO 2019095451A1 CN 2017114495 W CN2017114495 W CN 2017114495W WO 2019095451 A1 WO2019095451 A1 WO 2019095451A1
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Prior art keywords
thin film
film transistor
control signal
potential
scan control
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PCT/CN2017/114495
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English (en)
French (fr)
Inventor
王珊
温亦谦
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Priority to EP17932078.3A priority Critical patent/EP3712877A4/en
Priority to KR1020207016064A priority patent/KR102323292B1/ko
Priority to JP2020524061A priority patent/JP6899965B2/ja
Priority to US15/742,659 priority patent/US10497316B2/en
Publication of WO2019095451A1 publication Critical patent/WO2019095451A1/zh
Anticipated expiration legal-status Critical
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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
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    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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
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    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0852—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor being a dynamic memory with more than one capacitor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0262—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
    • 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
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • 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
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    • G—PHYSICS
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    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements

Definitions

  • the present invention relates to the field of display technologies, and in particular, to an AMOLED pixel driving circuit and a driving method thereof.
  • OLED Organic Light Emitting Display
  • OLED Organic Light Emitting Display
  • the OLED display device can be divided into two types: passive matrix OLED (PMOLED) and active matrix OLED (AMOLED), namely direct addressing and thin film transistor (Thin Film Transistor, according to the driving method). TFT) matrix addressing two types.
  • the AMOLED has pixels arranged in an array, belongs to an active display type, has high luminous efficiency, and is generally used as a high-definition large-sized display device.
  • the AMOLED is a current driving device. When a current flows through the organic light emitting diode, the organic light emitting diode emits light, and the luminance of the light is determined by the current flowing through the organic light emitting diode itself. Most existing integrated circuits (ICs) only transmit voltage signals, so the pixel driving circuit of AMOLED needs to complete the task of converting a voltage signal into a current signal.
  • the conventional AMOLED pixel driving circuit is usually 2T1C, that is, a structure in which two thin film transistors are added with a capacitor to convert a voltage into a current.
  • a compensation circuit is added to each pixel, and compensation means that the threshold voltage of the driving thin film transistor in each pixel must be compensated so that the current flowing through the organic light emitting diode becomes independent of the threshold voltage.
  • a 7T2C structure AMOLED pixel driving circuit includes seven thin film transistors and two capacitors: a first thin film transistor T10, a second thin film transistor T20, a third thin film transistor T30, and a fourth thin film.
  • the working process of the circuit includes: the first stage 10, The second stage 20 and the third stage 30, wherein the second stage 20, the second scan control signal S20 provides a low potential after providing a high potential, and when the second scan control signal S20 provides a low potential, Due to the action of the first capacitor C1, the potential at the connection point of the first capacitor C1 and the second capacitor C2 is unstable, and the pixel driving circuit requires 7 thin film transistors and 2 capacitors, and the structure is complicated, and the effective light emission of the pixel The area is low and the number of scan control signals is large, making the timing controller more complicated.
  • An object of the present invention is to provide an AMOLED pixel driving circuit capable of effectively compensating for a threshold voltage of a driving thin film transistor, ensuring uniform brightness of an organic light emitting diode, simplifying a pixel driving circuit structure, and increasing an effective light emitting area.
  • the object of the present invention is to provide an AMOLED pixel driving method, which can effectively compensate the threshold voltage of the driving thin film transistor, stabilize the current flowing through the organic light emitting diode, ensure the uniform brightness of the organic light emitting diode, and improve the display effect of the screen.
  • the present invention provides an AMOLED pixel driving circuit, including: a first thin film transistor, a second thin film transistor, a third thin film transistor, a fourth thin film transistor, a fifth thin film transistor, a sixth thin film transistor, a capacitor, And organic light emitting diodes;
  • the gate of the first thin film transistor is connected to the second scan control signal, the source is electrically connected to the data signal, and the drain is electrically connected to the first node;
  • the gate of the second thin film transistor is connected to the third scan control signal, the source is electrically connected to the first node, and the drain is electrically connected to the second node;
  • the gate of the third thin film transistor is connected to the first scan control signal, the source is electrically connected to the second node, and the drain is electrically connected to the third node;
  • the gate of the fourth thin film transistor is connected to the third scan control signal, the source is electrically connected to the third node, and the drain is electrically connected to the anode of the organic light emitting diode;
  • the gate of the fifth thin film transistor is connected to the third scan control signal, the source is connected to the reference voltage, and the drain is electrically connected to the second node;
  • the gate of the sixth thin film transistor is electrically connected to the first node, the drain is connected to the high voltage of the power source, and the source is electrically connected to the third node;
  • One end of the capacitor is electrically connected to the second node, and the other end is electrically connected to the third node;
  • the cathode of the organic light emitting diode is connected to a power supply low voltage
  • the fifth thin film transistor is one of an N-type thin film transistor and a P-type thin film transistor
  • the first, second, third, fourth, and sixth thin film transistors are both an N-type thin film transistor and a P-type thin film transistor.
  • the other is different from the fifth thin film transistor.
  • the first scan control signal, the second scan control signal, and the third scan control signal are combined to sequentially correspond to a data voltage storage phase, a threshold voltage compensation phase, and a display illumination phase, and control the organic light emitting diode No light is emitted during a data voltage storage phase and a threshold voltage compensation phase.
  • the first scan control signal provides a first potential
  • the second scan control signal provides a first potential
  • the third scan control signal provides a second potential different from the first potential
  • the first thin film transistor, the third thin film transistor, and the fifth thin film transistor are turned on, and the second thin film transistor and the fourth thin film transistor are turned off;
  • the first scan control signal provides a second potential
  • the second scan control signal provides a first potential to provide a second potential
  • the third scan control signal provides a second potential
  • the fifth The thin film transistor is turned on, the second thin film transistor, the third thin film transistor, and the fourth thin film transistor are turned off, and the first thin film transistor is turned on and then turned off;
  • the first scan control signal provides a second potential
  • the second scan control signal provides a second potential
  • the third scan control signal provides a first potential
  • the second thin film transistor and the fourth thin film
  • the transistor is turned on, and the first thin film transistor, the third thin film transistor, and the fifth thin film transistor are turned off.
  • the fifth thin film transistor is a P-type thin film transistor
  • the first, second, third, fourth, and sixth thin film transistors are all N-type thin film transistors.
  • the first potential is a high potential and the second potential is a low potential.
  • the fifth thin film transistor is an N-type thin film transistor
  • the first, second, third, fourth, and sixth thin film transistors are all P-type thin film transistors.
  • the first potential is a low potential and the second potential is a high potential.
  • the first scan control signal, the second scan control signal, and the third scan control signal are both provided by an external timing controller.
  • the first thin film transistor, the second thin film transistor, the third thin film transistor, the fourth thin film transistor, the fifth thin film transistor, and the sixth thin film transistor are all low temperature polysilicon thin film transistors, oxide semiconductor thin film transistors, or amorphous silicon thin film transistors .
  • the present invention also provides an AMOLED pixel driving method, which is applied to the above AMOLED pixel driving circuit, and includes the following steps:
  • Step S001 entering a data voltage storage phase
  • the first scan control signal provides a first potential
  • the second scan control signal provides a first potential
  • the third scan control signal provides a second potential different from the first potential
  • the first thin film transistor, the third thin film The transistor and the fifth thin film transistor are turned on, the second thin film transistor and the fourth thin film transistor are turned off, the data signal is written to the first node, and the reference voltage is written into the second section. Point and third node;
  • Step S002 entering a threshold voltage compensation phase
  • the first scan control signal provides a second potential
  • the second scan control signal first provides a second potential
  • the third scan control signal provides a second potential
  • the fifth thin film transistor is turned on
  • the second thin film transistor, the third thin film transistor, and the fourth thin film transistor are turned off, and the first thin film transistor is turned on and then turned off;
  • the third node When the second scan control signal is at the first potential, the third node is discharged through the sixth thin film transistor, so that the potential of the third node becomes Vdata-Vth, where Vdata is the voltage of the data signal, and Vth is the sixth The threshold voltage of the thin film transistor;
  • the voltage of the first node becomes zero, the voltage of the second node is maintained at the reference voltage, and the voltage of the third node is maintained at Vdata-Vth;
  • Step S003 entering a display lighting stage
  • the first scan control signal provides a second potential
  • the second scan control signal provides a second potential
  • the third scan control signal provides a first potential
  • the second thin film transistor, and the fourth thin film transistor are turned on
  • the first thin film transistor, the third thin film transistor, and the fifth thin film transistor are turned off, and the organic light emitting diode emits light.
  • the present invention also provides an AMOLED pixel driving circuit, comprising: a first thin film transistor, a second thin film transistor, a third thin film transistor, a fourth thin film transistor, a fifth thin film transistor, a sixth thin film transistor, a capacitor, and an organic light emitting diode;
  • the gate of the first thin film transistor is connected to the second scan control signal, the source is electrically connected to the data signal, and the drain is electrically connected to the first node;
  • the gate of the second thin film transistor is connected to the third scan control signal, the source is electrically connected to the first node, and the drain is electrically connected to the second node;
  • the gate of the third thin film transistor is connected to the first scan control signal, the source is electrically connected to the second node, and the drain is electrically connected to the third node;
  • the gate of the fourth thin film transistor is connected to the third scan control signal, the source is electrically connected to the third node, and the drain is electrically connected to the anode of the organic light emitting diode;
  • the gate of the fifth thin film transistor is connected to the third scan control signal, the source is connected to the reference voltage, and the drain is electrically connected to the second node;
  • the gate of the sixth thin film transistor is electrically connected to the first node, the drain is connected to the high voltage of the power source, and the source is electrically connected to the third node;
  • One end of the capacitor is electrically connected to the second node, and the other end is electrically connected to the third node;
  • the cathode of the organic light emitting diode is connected to a power supply low voltage
  • the fifth thin film transistor is one of an N-type thin film transistor and a P-type thin film transistor.
  • the first, second, third, fourth, and sixth thin film transistors are each of an N-type thin film transistor and a P-type thin film transistor different from the fifth thin film transistor;
  • the first scan control signal, the second scan control signal, and the third scan control signal are combined to sequentially correspond to a data voltage storage phase, a threshold voltage compensation phase, and a display illumination phase, and control the
  • the organic light emitting diode does not emit light during a data voltage storage phase and a threshold voltage compensation phase;
  • the first scan control signal provides a first potential
  • the second scan control signal provides a first potential
  • the third scan control signal provides a second potential different from the first potential
  • the first scan control signal provides a second potential
  • the second scan control signal provides a first potential to provide a second potential
  • the third scan control signal provides a second potential
  • the fifth thin film transistor is turned on, the second thin film transistor, the third thin film transistor, and the fourth thin film transistor are turned off, and the first thin film transistor is turned on and then turned off;
  • the first scan control signal provides a second potential
  • the second scan control signal provides a second potential
  • the third scan control signal provides a first potential
  • the second thin film transistor and The four thin film transistors are turned on, and the first thin film transistor, the third thin film transistor, and the fifth thin film transistor are turned off;
  • the first scan control signal, the second scan control signal, and the third scan control signal are all provided by an external timing controller
  • the first thin film transistor, the second thin film transistor, the third thin film transistor, the fourth thin film transistor, the fifth thin film transistor, and the sixth thin film transistor are all low temperature polysilicon thin film transistors, oxide semiconductor thin film transistors, or amorphous silicon. Thin film transistor.
  • the invention provides an AMOLED pixel driving circuit, which adopts a pixel driving circuit of a 6T1C structure and is matched with a specific driving timing, and can effectively compensate a threshold voltage of a driving thin film transistor to flow through an organic light emitting diode.
  • the current is stable, ensuring uniform brightness of the organic light emitting diode, improving the display effect of the picture, and reducing the number of thin film transistors and scanning control signals by collocation of the N-type thin film transistor and the P-type thin film transistor, thereby simplifying the structure of the pixel driving circuit and increasing Large effective light-emitting area.
  • the invention also provides an AMOLED pixel driving method, which can effectively compensate the threshold voltage of the driving thin film transistor, stabilize the current flowing through the organic light emitting diode, ensure the uniform brightness of the organic light emitting diode, and improve the display effect of the screen.
  • FIG. 1 is a circuit diagram of a conventional AMOLED pixel driving circuit
  • FIG. 2 is a timing diagram of the AMOLED pixel driving circuit shown in FIG. 1;
  • FIG. 3 is a circuit diagram of an AMOLED pixel driving circuit of the present invention.
  • FIG. 4 is a timing diagram of an AMOLED pixel driving circuit of the present invention.
  • FIG. 5 is a schematic diagram of step S001 of the AMOLED pixel driving method of the present invention.
  • FIG. 6 and FIG. 7 are schematic diagrams showing step S002 of the AMOLED pixel driving method of the present invention.
  • FIG. 8 is a schematic diagram of step S003 of the AMOLED pixel driving method of the present invention.
  • FIG. 9 is a flowchart of a method for driving an AMOLED pixel according to the present invention.
  • the present invention provides an AMOLED pixel driving circuit, including: a first thin film transistor T1, a second thin film transistor T2, a third thin film transistor T3, a fourth thin film transistor T4, a fifth thin film transistor T5, and a sixth thin film.
  • the gate of the first thin film transistor T1 is connected to the second scan control signal S2, the source is electrically connected to the data signal Data, and the drain is electrically connected to the first node A;
  • the gate of the second thin film transistor T2 is connected to the third scan control signal S3, the source is electrically connected to the first node A, and the drain is electrically connected to the second node B;
  • the gate of the third thin film transistor T3 is connected to the first scan control signal S1, the source is electrically connected to the second node B, and the drain is electrically connected to the third node C;
  • the gate of the fourth thin film transistor T4 is connected to the third scan control signal S3, the source is electrically connected to the third node C, and the drain is electrically connected to the anode of the organic light emitting diode D;
  • the gate of the fifth thin film transistor T5 is connected to the third scan control signal S3, the source is connected to the reference voltage Vref, and the drain is electrically connected to the second node B;
  • the gate of the sixth thin film transistor T6 is electrically connected to the first node A, the drain is connected to the power supply high voltage OVDD, and the source is electrically connected to the third node C;
  • One end of the capacitor C1 is electrically connected to the second node B, and the other end is electrically connected to the third node C;
  • the cathode of the organic light emitting diode D is connected to a power supply low voltage OVSS.
  • the fifth thin film transistor T5 is one of an N-type thin film transistor and a P-type thin film transistor
  • the first, second, third, fourth, and sixth thin film transistors T1, T2, T3, and T4, T6 is another of the N-type thin film transistor and the P-type thin film transistor different from the fifth thin film transistor T5.
  • the working process of the AMOLED pixel driving circuit of the present invention is: the first scan control signal S1, the second scan control signal S2, and the third scan control signal S3 are combined, which sequentially correspond to A data voltage storage phase 1, a threshold voltage compensation phase 2, and a display illumination phase 3, and controlling the organic light emitting diode D to emit light in a data voltage storage phase 1 and a threshold voltage compensation phase 2.
  • the first scan control signal S1 provides a first potential
  • the second scan control signal S2 provides a first potential
  • the third scan control signal S3 provides Different from the second potential of the first potential
  • the first thin film transistor T1, the third thin film transistor T3, and the fifth thin film transistor T5 are turned on
  • the second thin film transistor T2 and the fourth thin film transistor T4 are turned off
  • the data signal Data is Writing to the first node A
  • the reference voltage Vref is written to the second node B and the third node C.
  • the voltage of the first node A is equal to the voltage Vdata of the data signal
  • the voltages of the second node B and the third node C are equal to the reference voltage Vref.
  • the first scan control signal S1 provides a second potential
  • the second scan control signal S2 first provides a first potential and then provides a second potential.
  • the third scan control signal S3 provides a second potential
  • the fifth thin film transistor T5 is turned on
  • the third thin film transistor T3, and the fourth thin film transistor T4 are turned off
  • the first thin film transistor T1 is turned off. Open first and then close;
  • the first scan control signal S1 provides a second potential
  • the second scan control signal S2 provides a second potential
  • the third scan control signal S3 provides a first
  • the second thin film transistor T2 and the fourth thin film transistor T4 are turned on, the first thin film transistor T1, the third thin film transistor T3, and the fifth thin film transistor T5 are turned off, and the organic light emitting diode D emits light and flows through
  • the structural parameter of the transistor T6, Vgs is the gate-source voltage difference of the sixth thin film transistor T6.
  • the K value is relatively stable, so that the current flowing through the organic light-emitting diode D when the organic light-emitting diode D emits light
  • the threshold voltage of the sixth thin film transistor T6 is independent, and the problem that the current flowing through the organic light emitting diode is unstable due to the threshold voltage drift of the driving thin film transistor can be solved, and the light emitting of the organic light emitting diode is bright. Uniformity to improve the display of the picture.
  • the fifth thin film transistor T5 is a P-type thin film transistor
  • the first, second, third, fourth, and sixth thin film transistors T1, T2, and T3, Both T4 and T6 are N-type thin film transistors.
  • the first potential is a high potential and the second potential is a low potential.
  • the fifth thin film transistor T5 is an N-type thin film transistor
  • the first, second, third, fourth, and sixth thin film transistors T1, T2, and T3, Both T4 and T6 are P-type thin film transistors.
  • the first potential is a low potential and the second potential is a high potential.
  • the first scan control signal S1, the second scan control signal S2, and the third scan control signal S3 are all provided by an external timing controller.
  • the first thin film transistor T1, the second thin film transistor T2, the third thin film transistor T3, the fourth thin film transistor T4, the fifth thin film transistor T5, and the sixth thin film transistor T6 are all low temperature polysilicon thin film transistors and oxide semiconductors. Thin film transistor, or amorphous silicon thin film transistor.
  • an AMOLED pixel driving method of the present invention is applied to the above AMOLED pixel driving circuit, and includes the following steps:
  • Step S001 please refer to FIG. 5, entering the data voltage storage phase 1;
  • the first scan control signal S1 provides a first potential
  • the second scan control signal S2 provides a first potential
  • the third scan control signal S3 provides a second potential different from the first potential
  • the first thin film transistor T1 The third thin film transistor T3 and the fifth thin film transistor T5 are turned on, the second thin film transistor T2 and the fourth thin film transistor T4 are turned off, the data signal Data is written into the first node A, and the reference voltage Vref is written into the second node B and Three-node C.
  • step S001 the voltage of the first node A is equal to the voltage Vdata of the data signal, and the voltages of the second node B and the third node C are equal to the reference voltage Vref.
  • Step S002 please refer to FIG. 6 to 7, in the threshold voltage compensation phase 2;
  • the first scan control signal S1 provides a second potential
  • the second scan control signal S2 provides a first potential to provide a second potential
  • the third scan control signal S3 provides a second potential
  • the fifth thin film transistor T5 Opening, the second thin film transistor T2, the third thin film transistor T3, And the fourth thin film transistor T4 is turned off, and the first thin film transistor T1 is turned on first and then turned off.
  • step S002 when the second scan control signal S2 is at the first potential, the third node C is discharged through the sixth thin film transistor T6 until the sixth thin film transistor T6 is turned off, so that the potential of the third node C is It becomes Vdata-Vth, and the voltage difference of the capacitor C1 is Vref-(Vdata-Vth), where Vdata is the voltage of the data signal Data, and Vth is the threshold voltage of the sixth thin film transistor T6; the voltage of the first node A is maintained at the data The voltage of the signal Vdata, the voltage of the second node B is maintained at the reference voltage Vref.
  • step S002 when the second scan control signal S2 is at the second potential, the voltage of the first node A becomes zero, because the voltage difference of the capacitor C1 is constant, and the voltage of the second node B is maintained at The reference voltage Vref, the voltage of the third node C is maintained at Vdata-Vth.
  • Step S003 please refer to FIG. 8, entering the display illumination stage 3;
  • the first scan control signal S1 provides a second potential
  • the second scan control signal S2 provides a second potential
  • the third scan control signal S3 provides a first potential
  • the second thin film transistor T2 and the fourth thin film transistor
  • the K value is relatively stable, so that the organic light emitting diode D emits light.
  • the current flowing through the organic light emitting diode D is independent of the threshold voltage of the sixth thin film transistor T6, and can solve the problem that the current flowing through the organic light emitting diode is unstable due to the threshold voltage drift of the driving thin film transistor, and the light emitting of the organic light emitting diode Uniform brightness for improved picture display.
  • the present invention provides an AMOLED pixel driving circuit that uses a pixel driving circuit of a 6T1C structure and is matched with a specific driving timing to effectively compensate a threshold voltage of a driving thin film transistor to cause a current flowing through the organic light emitting diode.
  • Stable ensuring uniform brightness of the organic light-emitting diode, improving the display effect of the picture, and reducing the number of thin film transistors and scanning control signals by collocation of the N-type thin film transistor and the P-type thin film transistor, thereby simplifying the structure of the pixel driving circuit and increasing Effective illuminating area.
  • the invention also provides an AMOLED pixel driving method, which can effectively compensate the threshold voltage of the driving thin film transistor, stabilize the current flowing through the organic light emitting diode, ensure the uniform brightness of the organic light emitting diode, and improve the display effect of the screen.

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Abstract

一种AMOLED像素驱动电路及其驱动方法，其采用6T1C结构的像素驱动电路并搭配有特定的驱动时序，能够有效补偿驱动薄膜晶体管（T6）的阈值电压（Vth），使流过有机发光二极管（D）的电流稳定，保证有机发光二极管（D）的发光亮度均匀，改善画面的显示效果，同时通过N型薄膜晶体管和P型薄膜晶体管的搭配，减少薄膜晶体管和扫描控制信号的数量，从而简化像素驱动电路结构，增大有效发光面积。

Description

AMOLED像素驱动电路及其驱动方法 技术领域
本发明涉及显示技术领域，尤其涉及一种AMOLED像素驱动电路及其驱动方法。
背景技术
有机发光二极管(Organic Light Emitting Display，OLED)显示装置具有自发光、驱动电压低、发光效率高、响应时间短、清晰度与对比度高、近180°视角、使用温度范围宽，可实现柔性显示与大面积全色显示等诸多优点，被业界公认为是最有发展潜力的显示装置。
OLED显示装置按照驱动方式可以分为无源矩阵型OLED(Passive Matrix OLED，PMOLED)和有源矩阵型OLED(Active Matrix OLED，AMOLED)两大类，即直接寻址和薄膜晶体管(Thin Film Transistor，TFT)矩阵寻址两类。其中，AMOLED具有呈阵列式排布的像素，属于主动显示类型，发光效能高，通常用作高清晰度的大尺寸显示装置。
AMOLED是电流驱动器件，当有电流流过有机发光二极管时，有机发光二极管发光，且发光亮度由流过有机发光二极管自身的电流决定。大部分已有的集成电路(Integrated Circuit，IC)都只传输电压信号，故AMOLED的像素驱动电路需要完成将电压信号转变为电流信号的任务。传统的AMOLED像素驱动电路通常为2T1C，即两个薄膜晶体管加一个电容的结构，将电压变换为电流。随着驱动薄膜晶体管的阈值电压漂移，流过有机发光二极管的电流变化很大，导致有机发光二极管的发光很不稳定、亮度很不均匀，极大地影响画面的显示效果。要解决上述问题需对每一个像素加补偿电路，补偿意味着必须对每一个像素中的驱动薄膜晶体管的阈值电压进行补偿，使流过有机发光二级管的电流变得与阈值电压无关
如图1所示，一种7T2C结构的AMOLED像素驱动电路，包括7个薄膜晶体管和2个电容，分别为：第一薄膜晶体管T10、第二薄膜晶体管T20、第三薄膜晶体管T30、第四薄膜晶体管T40、第五薄膜晶体管T50、第六薄膜晶体管T60、第七薄膜晶体管T70、第一电容C10、及第二电容C20，该像素驱动电路需要4个扫描控制信号控制，分别为第一扫描控制信号S10、第二扫描控制信号S20、第三扫描控制信号S30、及第四扫描控制信号S40；该电路的工作时序图如图2所示，该电路的工作过程包括：第一阶段10、 第二阶段20、及第三阶段30，其中第二阶段20，所述第二扫描控制信号S20先提供高电位后提供低电位，此时当所述第二扫描控制信号S20提供低电位时，由于第一电容C1的作用，会导致第一电容C1和第二电容C2的连接点处的电位不稳定，并且该像素驱动电路需要7个薄膜晶体管和2个电容，结构复杂，像素的有效发光面积较低，扫描控制信号数量较多，使得时序控制器也较复杂。
发明内容
本发明的目的在于提供一种AMOLED像素驱动电路，能够有效补偿驱动薄膜晶体管的阈值电压，保证有机发光二极管的发光亮度均匀，简化像素驱动电路结构，增大有效发光面积。
本发明的目的还在于提供一种AMOLED像素驱动方法，能够有效补偿驱动薄膜晶体管的阈值电压，使流过有机发光二极管的电流稳定，保证有机发光二极管的发光亮度均匀，改善画面的显示效果。
为实现上述目的，本发明提供了一种AMOLED像素驱动电路，包括：第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、第四薄膜晶体管、第五薄膜晶体管、第六薄膜晶体管、电容、及有机发光二极管；
所述第一薄膜晶体管的栅极接入第二扫描控制信号，源极电性连接数据信号，漏极电性连接第一节点；
所述第二薄膜晶体管的栅极接入第三扫描控制信号，源极电性连接第一节点，漏极电性连接第二节点；
所述第三薄膜晶体管的栅极接入第一扫描控制信号，源极电性连接第二节点，漏极电性连接第三节点；
所述第四薄膜晶体管的栅极接入第三扫描控制信号，源极电性连接第三节点，漏极电性连接有机发光二极管的阳极；
所述第五薄膜晶体管的栅极接入第三扫描控制信号，源极接入参考电压，漏极电性连接第二节点；
所述第六薄膜晶体管的栅极电性连接第一节点，漏极接入电源高电压，源极电性连接第三节点；
所述电容的一端电性连接第二节点，另一端电性连接第三节点；
所述有机发光二极管的阴极接入电源低电压；
所述第五薄膜晶体管为N型薄膜晶体管和P型薄膜晶体管中的一种，所述第一、第二、第三、第四及第六薄膜晶体管均为N型薄膜晶体管和P型薄膜晶体管中不同于第五薄膜晶体管的另一种。
所述第一扫描控制信号、第二扫描控制信号、以及第三扫描控制信号相组合，先后对应于一数据电压存储阶段、一阈值电压补偿阶段、及显示发光阶段，并控制所述有机发光二极管在一数据电压存储阶段及一阈值电压补偿阶段不发光。
在所述数据电压存储阶段，所述第一扫描控制信号提供第一电位，所述第二扫描控制信号提供第一电位，第三扫描控制信号提供不同于第一电位的第二电位，所述第一薄膜晶体管、第三薄膜晶体管、及第五薄膜晶体管打开，所述第二薄膜晶体管及第四薄膜晶体管关闭；
在阈值电压补偿阶段，所述第一扫描控制信号提供第二电位，所述第二扫描控制信号先提供第一电位后提供第二电位，第三扫描控制信号提供第二电位，所述第五薄膜晶体管打开，所述第二薄膜晶体管、第三薄膜晶体管、及第四薄膜晶体管关闭，所述第一薄膜晶体管先打开后关闭；
在显示发光阶段，所述第一扫描控制信号提供第二电位，所述第二扫描控制信号提供第二电位，第三扫描控制信号提供第一电位，所述第二薄膜晶体管、及第四薄膜晶体管打开，所述第一薄膜晶体管、第三薄膜晶体管、及第五薄膜晶体管关闭。
所述第五薄膜晶体管为P型薄膜晶体管，所述第一、第二、第三、第四及第六薄膜晶体管均为N型薄膜晶体管。
所述第一电位为高电位，所述第二电位为低电位。
所述第五薄膜晶体管为N型薄膜晶体管，所述第一、第二、第三、第四及第六薄膜晶体管均为P型薄膜晶体管。
所述第一电位为低电位，所述第二电位为高电位。
所述第一扫描控制信号、第二扫描控制信号、与第三扫描控制信号均通过外部时序控制器提供。
所述第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、第四薄膜晶体管、第五薄膜晶体管、第六薄膜晶体管均为低温多晶硅薄膜晶体管、氧化物半导体薄膜晶体管、或非晶硅薄膜晶体管。
本发明还提供一种AMOLED像素驱动方法，应用于上述AMOLED像素驱动电路，包括如下步骤：
步骤S001、进入数据电压存储阶段；
所述第一扫描控制信号提供第一电位，所述第二扫描控制信号提供第一电位，第三扫描控制信号提供不同于第一电位的第二电位，所述第一薄膜晶体管、第三薄膜晶体管、及第五薄膜晶体管打开，所述第二薄膜晶体管及第四薄膜晶体管关闭，数据信号写入第一节点，参考电压写入第二节 点和第三节点；
步骤S002、进入阈值电压补偿阶段；
所述第一扫描控制信号提供第二电位，所述第二扫描控制信号先提供第一电位后提供第二电位，第三扫描控制信号提供第二电位，所述第五薄膜晶体管打开，所述第二薄膜晶体管、第三薄膜晶体管、及第四薄膜晶体管关闭，所述第一薄膜晶体管先打开后关闭；
在所述第二扫描控制信号为第一电位时，第三节点通过第六薄膜晶体管放电，使得第三节点的电位变为Vdata-Vth，电其中，Vdata为数据信号的电压，Vth为第六薄膜晶体管的阈值电压；
在所述第二扫描控制信号为第二电位时，第一节点的电压变为零，第二节点的电压维持在参考电压，第三节点的电压维持在Vdata-Vth；
步骤S003、进入显示发光阶段；
所述第一扫描控制信号提供第二电位，所述第二扫描控制信号提供第二电位，第三扫描控制信号提供第一电位，所述第二薄膜晶体管、及第四薄膜晶体管打开，所述第一薄膜晶体管、第三薄膜晶体管、及第五薄膜晶体管关闭，有机发光二极管发光。
本发明还提供一种AMOLED像素驱动电路，包括：第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、第四薄膜晶体管、第五薄膜晶体管、第六薄膜晶体管、电容、及有机发光二极管；
所述第一薄膜晶体管的栅极接入第二扫描控制信号，源极电性连接数据信号，漏极电性连接第一节点；
所述第二薄膜晶体管的栅极接入第三扫描控制信号，源极电性连接第一节点，漏极电性连接第二节点；
所述第三薄膜晶体管的栅极接入第一扫描控制信号，源极电性连接第二节点，漏极电性连接第三节点；
所述第四薄膜晶体管的栅极接入第三扫描控制信号，源极电性连接第三节点，漏极电性连接有机发光二极管的阳极；
所述第五薄膜晶体管的栅极接入第三扫描控制信号，源极接入参考电压，漏极电性连接第二节点；
所述第六薄膜晶体管的栅极电性连接第一节点，漏极接入电源高电压，源极电性连接第三节点；
所述电容的一端电性连接第二节点，另一端电性连接第三节点；
所述有机发光二极管的阴极接入电源低电压；
所述第五薄膜晶体管为N型薄膜晶体管和P型薄膜晶体管中的一种， 所述第一、第二、第三、第四及第六薄膜晶体管均为N型薄膜晶体管和P型薄膜晶体管中不同于第五薄膜晶体管的另一种；
其中，所述第一扫描控制信号、第二扫描控制信号、以及第三扫描控制信号相组合，先后对应于一数据电压存储阶段、一阈值电压补偿阶段、及一显示发光阶段，并控制所述有机发光二极管在一数据电压存储阶段及一阈值电压补偿阶段不发光；
其中，在所述数据电压存储阶段，所述第一扫描控制信号提供第一电位，所述第二扫描控制信号提供第一电位，第三扫描控制信号提供不同于第一电位的第二电位，所述第一薄膜晶体管、第三薄膜晶体管、及第五薄膜晶体管打开，所述第二薄膜晶体管及第四薄膜晶体管关闭；
在所述阈值电压补偿阶段，所述第一扫描控制信号提供第二电位，所述第二扫描控制信号先提供第一电位后提供第二电位，第三扫描控制信号提供第二电位，所述第五薄膜晶体管打开，所述第二薄膜晶体管、第三薄膜晶体管、及第四薄膜晶体管关闭，所述第一薄膜晶体管先打开后关闭；
在所述显示发光阶段，所述第一扫描控制信号提供第二电位，所述第二扫描控制信号提供第二电位，第三扫描控制信号提供第一电位，所述第二薄膜晶体管、及第四薄膜晶体管打开，所述第一薄膜晶体管、第三薄膜晶体管、及第五薄膜晶体管关闭；
其中，所述第一扫描控制信号、第二扫描控制信号、与第三扫描控制信号均通过外部时序控制器提供；
其中，所述第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、第四薄膜晶体管、第五薄膜晶体管、第六薄膜晶体管均为低温多晶硅薄膜晶体管、氧化物半导体薄膜晶体管、或非晶硅薄膜晶体管。
本发明的有益效果：本发明提供了一种AMOLED像素驱动电路，其采用6T1C结构的像素驱动电路并搭配有特定的驱动时序，能够有效补偿驱动薄膜晶体管的阈值电压，使流过有机发光二极管的电流稳定，保证有机发光二极管的发光亮度均匀，改善画面的显示效果，同时通过N型薄膜晶体管和P型薄膜晶体管的搭配，减少薄膜晶体管和扫描控制信号的数量，从而简化像素驱动电路结构，增大有效发光面积。本发明还提供一种AMOLED像素驱动方法，能够有效补偿驱动薄膜晶体管的阈值电压，使流过有机发光二极管的电流稳定，保证有机发光二极管的发光亮度均匀，改善画面的显示效果。
附图说明
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
附图中，
图1为现有的一种AMOLED像素驱动电路的电路图；
图2为图1所示的AMOLED像素驱动电路的时序图；
图3为本发明的AMOLED像素驱动电路的电路图；
图4为本发明的AMOLED像素驱动电路的时序图；
图5为本发明的AMOLED像素驱动方法的步骤S001的示意图；
图6和图7为本发明的AMOLED像素驱动方法的步骤S002的示意图；
图8为本发明的AMOLED像素驱动方法的步骤S003的示意图；
图9为本发明的AMOLED像素驱动方法流程图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。
请参阅图3，本发明提供一种AMOLED像素驱动电路，包括：第一薄膜晶体管T1、第二薄膜晶体管T2、第三薄膜晶体管T3、第四薄膜晶体管T4、第五薄膜晶体管T5、第六薄膜晶体管T6、电容C1、及有机发光二极管D；
所述第一薄膜晶体管T1的栅极接入第二扫描控制信号S2，源极电性连接数据信号Data，漏极电性连接第一节点A；
所述第二薄膜晶体管T2的栅极接入第三扫描控制信号S3，源极电性连接第一节点A，漏极电性连接第二节点B；
所述第三薄膜晶体管T3的栅极接入第一扫描控制信号S1，源极电性连接第二节点B，漏极电性连接第三节点C；
所述第四薄膜晶体管T4的栅极接入第三扫描控制信号S3，源极电性连接第三节点C，漏极电性连接有机发光二极管D的阳极；
所述第五薄膜晶体管T5的栅极接入第三扫描控制信号S3，源极接入参考电压Vref，漏极电性连接第二节点B；
所述第六薄膜晶体管T6的栅极电性连接第一节点A，漏极接入电源高电压OVDD，源极电性连接第三节点C；
所述电容C1的一端电性连接第二节点B，另一端电性连接第三节点C；
所述有机发光二极管D的阴极接入电源低电压OVSS。
其中，所述第五薄膜晶体管T5为N型薄膜晶体管和P型薄膜晶体管中的一种，所述第一、第二、第三、第四及第六薄膜晶体管T1、T2、T3、T4、T6均为N型薄膜晶体管和P型薄膜晶体管中不同于第五薄膜晶体管T5的另一种。
具体地，如图4所示，本发明的AMOLED像素驱动电路的工作过程为：所述第一扫描控制信号S1、第二扫描控制信号S2、以及第三扫描控制信号S3相组合，先后对应于一数据电压存储阶段1、一阈值电压补偿阶段2、及显示发光阶段3，并控制所述有机发光二极管D在一数据电压存储阶段1及一阈值电压补偿阶段2不发光。
其中，如图5所示，在所述数据电压存储阶段1，所述第一扫描控制信号S1提供第一电位，所述第二扫描控制信号S2提供第一电位，第三扫描控制信号S3提供不同于第一电位的第二电位，所述第一薄膜晶体管T1、第三薄膜晶体管T3、及第五薄膜晶体管T5开，所述第二薄膜晶体管T2及第四薄膜晶体管T4关闭，数据信号Data写入第一节点A，参考电压Vref写入第二节点B和第三节点C，第一节点A的电压等于数据信号的电压Vdata，第二节点B和第三节点C的电压等于参考电压Vref；
进一步地，如图6和图7所示，在阈值电压补偿阶段2，所述第一扫描控制信号S1提供第二电位，所述第二扫描控制信号S2先提供第一电位后提供第二电位，第三扫描控制信号S3提供第二电位，所述第五薄膜晶体管T5打开，所述第二薄膜晶体管T2、第三薄膜晶体管T3、及第四薄膜晶体管T4关闭，所述第一薄膜晶体管T1先打开后关闭；
详细地，如图6所示，在所述第二扫描控制信号S2为第一电位时，第三节点C通过第六薄膜晶体管T6放电，直至第六薄膜晶体管T6截止，使得第三节点C的电位变为Vdata-Vth，电容C1的压差为Vref-(Vdata-Vth)，其中，Vdata为数据信号Data的电压，Vth为第六薄膜晶体管T6的阈值电压，第一节点A的电压维持在数据信号的电压Vdata，第二节点B的电压维持在参考电压Vref；如图7所示，在所述第二扫描控制信号S2为第二电位时，第一节点A的电压变为零，因为电容C1的压差不变，第二节点B的电压维持在参考电压Vref，第三节点C的电压维持在Vdata-Vth；
进一步地，如图8所示，在显示发光阶段3，所述第一扫描控制信号S1提供第二电位，所述第二扫描控制信号S2提供第二电位，第三扫描控制信号S3提供第一电位，所述第二薄膜晶体管T2、及第四薄膜晶体管T4打开，所述第一薄膜晶体管T1、第三薄膜晶体管T3、及第五薄膜晶体管T5关闭，所述有机发光二极管D发光，流过有机发光二极管D的电流Ioled 等于Ioled＝k(Vgs-Vth)2＝k(Vref-Vdata+Vth-Vth)2＝k(Vref-Vdata)2，其中，k为驱动薄膜晶体管也即第六薄膜晶体管T6的结构参数，Vgs为第六薄膜晶体管T6的栅源极压差，对于相同结构的薄膜晶体管，K值相对稳定，从而有机发光二极管D发光时流经所述有机发光二极管D的电流与第六薄膜晶体管T6的阈值电压无关，能够解决由驱动薄膜晶体管阈值电压漂移导致的流过有机发光二极管的电流不稳定的问题，使有机发光二极管的发光亮度均匀，改善画面的显示效果。
优选地，在本发明的第一实施例中，所述第五薄膜晶体管T5为P型薄膜晶体管，所述第一、第二、第三、第四及第六薄膜晶体管T1、T2、T3、T4、T6均为N型薄膜晶体管。所述第一电位为高电位，所述第二电位为低电位。
优选地，在本发明的第二实施例中，所述第五薄膜晶体管T5为N型薄膜晶体管，所述第一、第二、第三、第四及第六薄膜晶体管T1、T2、T3、T4、T6均为P型薄膜晶体管。所述第一电位为低电位，所述第二电位为高电位。
具体地，所述第一扫描控制信号S1、第二扫描控制信号S2、与第三扫描控制信号S3均通过外部时序控制器提供。
具体地，所述第一薄膜晶体管T1、第二薄膜晶体管T2、第三薄膜晶体管T3、第四薄膜晶体管T4、第五薄膜晶体管T5、第六薄膜晶体管T6均为低温多晶硅薄膜晶体管、氧化物半导体薄膜晶体管、或非晶硅薄膜晶体管。
请参阅图9，本发明一种AMOLED像素驱动方法，应用于上述的AMOLED像素驱动电路，包括如下步骤：
步骤S001、请参阅图5，进入数据电压存储阶段1；
所述第一扫描控制信号S1提供第一电位，所述第二扫描控制信号S2提供第一电位，第三扫描控制信号S3提供不同于第一电位的第二电位，所述第一薄膜晶体管T1、第三薄膜晶体管T3、第五薄膜晶体管T5打开，所述第二薄膜晶体管T2及第四薄膜晶体管T4关闭，数据信号Data写入第一节点A，参考电压Vref写入第二节点B和第三节点C。
具体地，在步骤S001中，第一节点A的电压等于数据信号的电压Vdata，第二节点B和第三节点C的电压等于参考电压Vref。
步骤S002、请参阅图6至7，在阈值电压补偿阶段2；
所述第一扫描控制信号S1提供第二电位，所述第二扫描控制信号S2先提供第一电位后提供第二电位，第三扫描控制信号S3提供第二电位，所述第五薄膜晶体管T5打开，所述第二薄膜晶体管T2、第三薄膜晶体管T3、 及第四薄膜晶体管T4关闭，所述第一薄膜晶体管T1先打开后关闭。
具体地，在步骤S002中，在所述第二扫描控制信号S2为第一电位时，第三节点C通过第六薄膜晶体管T6放电，直至第六薄膜晶体管T6截止，使得第三节点C的电位变为Vdata-Vth，电容C1的压差为Vref-(Vdata-Vth)，其中，Vdata为数据信号Data的电压，Vth为第六薄膜晶体管T6的阈值电压；第一节点A的电压维持在数据信号的电压Vdata，第二节点B的电压维持在参考电压Vref。
进一步地，在步骤S002中，在所述第二扫描控制信号S2为第二电位时，第一节点A的电压变为零，因为电容C1的压差不变，第二节点B的电压维持在参考电压Vref，第三节点C的电压维持在Vdata-Vth。
步骤S003、请参阅图8，进入显示发光阶段3；
所述第一扫描控制信号S1提供第二电位，所述第二扫描控制信号S2提供第二电位，第三扫描控制信号S3提供第一电位，所述第二薄膜晶体管T2、及第四薄膜晶体管T4打开，所述第一薄膜晶体管T1、第三薄膜晶体管T3、及第五薄膜晶体管T5关闭，有机发光二极管D发光。
具体地，所述步骤S003中，流过有机发光二极管D的电流Ioled等于Ioled＝k(Vgs-Vth)2＝k(Vref-Vdata+Vth-Vth)2＝k(Vref-Vdata)2，其中，k为驱动薄膜晶体管也即第六薄膜晶体管T6的结构参数，Vgs为第六薄膜晶体管T6的栅源极压差，对于相同结构的薄膜晶体管，K值相对稳定，从而有机发光二极管D发光时流经所述有机发光二极管D的电流与第六薄膜晶体管T6的阈值电压无关，能够解决由驱动薄膜晶体管阈值电压漂移导致的流过有机发光二极管的电流不稳定的问题，使有机发光二极管的发光亮度均匀，改善画面的显示效果。
综上所述，本发明提供了一种AMOLED像素驱动电路，其采用6T1C结构的像素驱动电路并搭配有特定的驱动时序，能够有效补偿驱动薄膜晶体管的阈值电压，使流过有机发光二极管的电流稳定，保证有机发光二极管的发光亮度均匀，改善画面的显示效果，同时通过N型薄膜晶体管和P型薄膜晶体管的搭配，减少薄膜晶体管和扫描控制信号的数量，从而简化像素驱动电路结构，增大有效发光面积。本发明还提供一种AMOLED像素驱动方法，能够有效补偿驱动薄膜晶体管的阈值电压，使流过有机发光二极管的电流稳定，保证有机发光二极管的发光亮度均匀，改善画面的显示效果。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形 都应属于本发明权利要求的保护范围。

Claims (15)

  1. 一种AMOLED像素驱动电路，包括：第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、第四薄膜晶体管、第五薄膜晶体管、第六薄膜晶体管、电容、及有机发光二极管；
    所述第一薄膜晶体管的栅极接入第二扫描控制信号，源极电性连接数据信号，漏极电性连接第一节点；
    所述第二薄膜晶体管的栅极接入第三扫描控制信号，源极电性连接第一节点，漏极电性连接第二节点；
    所述第三薄膜晶体管的栅极接入第一扫描控制信号，源极电性连接第二节点，漏极电性连接第三节点；
    所述第四薄膜晶体管的栅极接入第三扫描控制信号，源极电性连接第三节点，漏极电性连接有机发光二极管的阳极；
    所述第五薄膜晶体管的栅极接入第三扫描控制信号，源极接入参考电压，漏极电性连接第二节点；
    所述第六薄膜晶体管的栅极电性连接第一节点，漏极接入电源高电压，源极电性连接第三节点；
    所述电容的一端电性连接第二节点，另一端电性连接第三节点；
    所述有机发光二极管的阴极接入电源低电压；
    所述第五薄膜晶体管为N型薄膜晶体管和P型薄膜晶体管中的一种，所述第一、第二、第三、第四及第六薄膜晶体管均为N型薄膜晶体管和P型薄膜晶体管中不同于第五薄膜晶体管的另一种。
  2. 如权利要求1所述的AMOLED像素驱动电路，其中，所述第一扫描控制信号、第二扫描控制信号、以及第三扫描控制信号相组合，先后对应于一数据电压存储阶段、一阈值电压补偿阶段、及一显示发光阶段，并控制所述有机发光二极管在一数据电压存储阶段及一阈值电压补偿阶段不发光。
  3. 如权利要求2所述的AMOLED像素驱动电路，其中，
    在所述数据电压存储阶段，所述第一扫描控制信号提供第一电位，所述第二扫描控制信号提供第一电位，第三扫描控制信号提供不同于第一电位的第二电位，所述第一薄膜晶体管、第三薄膜晶体管、及第五薄膜晶体管打开，所述第二薄膜晶体管及第四薄膜晶体管关闭；
    在所述阈值电压补偿阶段，所述第一扫描控制信号提供第二电位，所 述第二扫描控制信号先提供第一电位后提供第二电位，第三扫描控制信号提供第二电位，所述第五薄膜晶体管打开，所述第二薄膜晶体管、第三薄膜晶体管、及第四薄膜晶体管关闭，所述第一薄膜晶体管先打开后关闭；
    在所述显示发光阶段，所述第一扫描控制信号提供第二电位，所述第二扫描控制信号提供第二电位，第三扫描控制信号提供第一电位，所述第二薄膜晶体管、及第四薄膜晶体管打开，所述第一薄膜晶体管、第三薄膜晶体管、及第五薄膜晶体管关闭。
  4. 如权利要求3所述的AMOLED像素驱动电路，其中，所述第五薄膜晶体管为P型薄膜晶体管，所述第一、第二、第三、第四及第六薄膜晶体管均为N型薄膜晶体管。
  5. 如权利要求4所述的AMOLED像素驱动电路，其中，所述第一电位为高电位，所述第二电位为低电位。
  6. 如权利要求3所述的AMOLED像素驱动电路，其中，所述第五薄膜晶体管为N型薄膜晶体管，所述第一、第二、第三、第四及第六薄膜晶体管均为P型薄膜晶体管。
  7. 如权利要求6所述的AMOLED像素驱动电路，其中，所述第一电位为低电位，所述第二电位为高电位。
  8. 如权利要求1所述的AMOLED像素驱动电路，其中，所述第一扫描控制信号、第二扫描控制信号、与第三扫描控制信号均通过外部时序控制器提供。
  9. 如权利要求1所述的AMOLED像素驱动电路，其中，所述第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、第四薄膜晶体管、第五薄膜晶体管、第六薄膜晶体管均为低温多晶硅薄膜晶体管、氧化物半导体薄膜晶体管、或非晶硅薄膜晶体管。
  10. 一种AMOLED像素驱动方法，应用于上述权利要求1所述的AMOLED像素驱动电路，包括如下步骤：
    步骤S001、进入数据电压存储阶段；
    所述第一扫描控制信号提供第一电位，所述第二扫描控制信号提供第一电位，第三扫描控制信号提供不同于第一电位的第二电位，所述第一薄膜晶体管、第三薄膜晶体管、及第五薄膜晶体管打开，所述第二薄膜晶体管及第四薄膜晶体管关闭，数据信号写入第一节点，参考电压写入第二节点和第三节点；
    步骤S002、进入阈值电压补偿阶段；
    所述第一扫描控制信号提供第二电位，所述第二扫描控制信号先提供 第一电位后提供第二电位，第三扫描控制信号提供第二电位，所述第五薄膜晶体管打开，所述第二薄膜晶体管、第三薄膜晶体管、及第四薄膜晶体管关闭，所述第一薄膜晶体管先打开后关闭；
    在所述第二扫描控制信号为第一电位时，第三节点通过第六薄膜晶体管放电，使得第三节点的电位变为Vdata-Vth，其中，Vdata为数据信号的电压，Vth为第六薄膜晶体管的阈值电压；
    在所述第二扫描控制信号为第二电位时，第一节点的电压变为零，第二节点的电压维持在参考电压，第三节点的电压维持在Vdata-Vth；
    步骤S003、进入显示发光阶段；
    所述第一扫描控制信号提供第二电位，所述第二扫描控制信号提供第二电位，第三扫描控制信号提供第一电位，所述第二薄膜晶体管、及第四薄膜晶体管打开，所述第一薄膜晶体管、第三薄膜晶体管、及第五薄膜晶体管关闭，有机发光二极管发光。
  11. 一种AMOLED像素驱动电路，包括：第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、第四薄膜晶体管、第五薄膜晶体管、第六薄膜晶体管、电容、及有机发光二极管；
    所述第一薄膜晶体管的栅极接入第二扫描控制信号，源极电性连接数据信号，漏极电性连接第一节点；
    所述第二薄膜晶体管的栅极接入第三扫描控制信号，源极电性连接第一节点，漏极电性连接第二节点；
    所述第三薄膜晶体管的栅极接入第一扫描控制信号，源极电性连接第二节点，漏极电性连接第三节点；
    所述第四薄膜晶体管的栅极接入第三扫描控制信号，源极电性连接第三节点，漏极电性连接有机发光二极管的阳极；
    所述第五薄膜晶体管的栅极接入第三扫描控制信号，源极接入参考电压，漏极电性连接第二节点；
    所述第六薄膜晶体管的栅极电性连接第一节点，漏极接入电源高电压，源极电性连接第三节点；
    所述电容的一端电性连接第二节点，另一端电性连接第三节点；
    所述有机发光二极管的阴极接入电源低电压；
    所述第五薄膜晶体管为N型薄膜晶体管和P型薄膜晶体管中的一种，所述第一、第二、第三、第四及第六薄膜晶体管均为N型薄膜晶体管和P型薄膜晶体管中不同于第五薄膜晶体管的另一种；
    其中，所述第一扫描控制信号、第二扫描控制信号、以及第三扫描控 制信号相组合，先后对应于一数据电压存储阶段、一阈值电压补偿阶段、及一显示发光阶段，并控制所述有机发光二极管在一数据电压存储阶段及一阈值电压补偿阶段不发光；
    其中，在所述数据电压存储阶段，所述第一扫描控制信号提供第一电位，所述第二扫描控制信号提供第一电位，第三扫描控制信号提供不同于第一电位的第二电位，所述第一薄膜晶体管、第三薄膜晶体管、及第五薄膜晶体管打开，所述第二薄膜晶体管及第四薄膜晶体管关闭；
    在所述阈值电压补偿阶段，所述第一扫描控制信号提供第二电位，所述第二扫描控制信号先提供第一电位后提供第二电位，第三扫描控制信号提供第二电位，所述第五薄膜晶体管打开，所述第二薄膜晶体管、第三薄膜晶体管、及第四薄膜晶体管关闭，所述第一薄膜晶体管先打开后关闭；
    在所述显示发光阶段，所述第一扫描控制信号提供第二电位，所述第二扫描控制信号提供第二电位，第三扫描控制信号提供第一电位，所述第二薄膜晶体管、及第四薄膜晶体管打开，所述第一薄膜晶体管、第三薄膜晶体管、及第五薄膜晶体管关闭；
    其中，所述第一扫描控制信号、第二扫描控制信号、与第三扫描控制信号均通过外部时序控制器提供；
    其中，所述第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、第四薄膜晶体管、第五薄膜晶体管、第六薄膜晶体管均为低温多晶硅薄膜晶体管、氧化物半导体薄膜晶体管、或非晶硅薄膜晶体管。
  12. 如权利要求11所述的AMOLED像素驱动电路，其中，所述第五薄膜晶体管为P型薄膜晶体管，所述第一、第二、第三、第四及第六薄膜晶体管均为N型薄膜晶体管。
  13. 如权利要求12所述的AMOLED像素驱动电路，其中，所述第一电位为高电位，所述第二电位为低电位。
  14. 如权利要求11所述的AMOLED像素驱动电路，其中，所述第五薄膜晶体管为N型薄膜晶体管，所述第一、第二、第三、第四及第六薄膜晶体管均为P型薄膜晶体管。
  15. 如权利要求14所述的AMOLED像素驱动电路，其中，所述第一电位为低电位，所述第二电位为高电位。
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