WO2019061784A1 - Amoled显示面板的扫描驱动系统 - Google Patents

Amoled显示面板的扫描驱动系统 Download PDF

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Publication number
WO2019061784A1
WO2019061784A1 PCT/CN2017/112972 CN2017112972W WO2019061784A1 WO 2019061784 A1 WO2019061784 A1 WO 2019061784A1 CN 2017112972 W CN2017112972 W CN 2017112972W WO 2019061784 A1 WO2019061784 A1 WO 2019061784A1
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thin film
film transistor
signal
output end
electrically connected
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PCT/CN2017/112972
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English (en)
French (fr)
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王利民
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深圳市华星光电半导体显示技术有限公司
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Priority to US15/736,565 priority Critical patent/US10621923B2/en
Publication of WO2019061784A1 publication Critical patent/WO2019061784A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3266—Details of drivers for scan electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0465—Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
    • 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
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0262—The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a scan driving system for an AMOLED display panel.
  • 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.
  • the organic light emitting diode 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 AMOLED pixel driving circuit is provided with a driving thin film transistor for driving the organic light emitting diode to emit light.
  • the aging of the organic light emitting diode and the threshold voltage shift of the driving thin film transistor may cause the display of the OLED display device. The quality is degraded, so it is necessary to compensate the threshold voltage of the driving thin film transistor during use of the OLED display device to ensure the display quality of the OLED display device.
  • the compensation technology of AMOLED is divided into two categories: internal compensation and external compensation, and most of them require more TFTs for compensation purposes. Therefore, more scan drive signals are needed, especially internal compensation technology, and the design of the gate drive circuit. More critical to success, the more complex the internal compensation circuit requires more scanning signals, and the large number of scanning signal requirements bring a severe test to the driver IC (Drive IC) and panel circuit design, and cause the panel cost. Improvement.
  • An object of the present invention is to provide a scan driving system for an AMOLED display panel, which is capable of While implementing the internal compensation function, the number of output channels of the gate drive circuit is reduced.
  • the present invention provides a scan driving system for an AMOLED display panel, comprising: a gate driving circuit, a scanning signal selecting circuit, and a pixel driving circuit;
  • the scan signal selection circuit has a first input end, a second input end, a first control end, a second control end, a first output end, and a second output end; the first input end of the scan signal selection circuit is The gate driving circuit is electrically connected, the second input end is connected to the low potential signal, and the first control end and the second control end respectively access the first control signal and the second control signal, the first output end and the second output end
  • the terminals are electrically connected to the pixel driving circuit
  • the gate driving circuit is configured to output a scan signal to a first input end of the scan signal selection circuit
  • the scan signal selection circuit is configured to control the first output end and the second output end to simultaneously output a low potential signal to the pixel driving circuit according to the first control signal and the second control signal, and simultaneously output a scan signal And outputting a low potential signal and a scan signal, respectively, or respectively outputting a scan signal and a low potential signal.
  • the first output end and the second output end simultaneously output a low potential signal to the pixel driving circuit
  • the first output end and the second output end respectively output a low potential signal and a scan signal to the pixel driving circuit
  • the first output terminal and the second output terminal respectively output a scan signal and a low potential signal to the pixel driving circuit.
  • the scan signal selection circuit includes: a first thin film transistor, a second thin film transistor, a third thin film transistor, a fourth thin film transistor, a first inverter, and a second inverter;
  • the gate of the first thin film transistor is electrically connected to the output end of the first inverter, the source is connected to the low potential signal, and the drain is electrically connected to the drain of the second thin film transistor;
  • the gate of the second thin film transistor is electrically connected to the input end of the first inverter, and the source is connected to the scan signal;
  • the gate of the third thin film transistor is electrically connected to the input end of the second inverter, the source is electrically connected to the source of the second thin film transistor, and the drain is electrically connected to the drain of the fourth thin film transistor;
  • the gate of the fourth thin film transistor is electrically connected to the output end of the second inverter, and the source is connected to the low potential signal;
  • the input end of the first inverter and the input end of the second inverter respectively access the first control signal and the second control signal.
  • the pixel driving circuit includes: a fifth thin film transistor, a sixth thin film transistor, a seventh thin film transistor, an eighth thin film transistor, a ninth thin film transistor, a capacitor, and an organic light emitting diode;
  • the gate of the fifth thin film transistor is electrically connected to the first output end of the scan signal selection circuit, the source is connected to the sustain voltage, and the drain is electrically connected to the first end of the capacitor;
  • the gate of the sixth thin film transistor is electrically connected to the second output end of the scan signal selection circuit, the source is connected to the data signal, and the drain is electrically connected to the first end of the capacitor;
  • the gate of the seventh thin film transistor is electrically connected to the second output end of the scan signal selection circuit, the source is electrically connected to the source of the eighth thin film transistor, and the drain is electrically connected to the ninth thin film transistor.
  • the gate of the eighth thin film transistor is electrically connected to the first output end of the scan signal selection circuit, and the drain is connected to the power supply high voltage;
  • the drain of the ninth thin film transistor is electrically connected to the source of the eighth thin film transistor, and the source is electrically connected to the anode of the organic light emitting diode;
  • the second end of the capacitor is electrically connected to the gate of the ninth thin film transistor
  • the cathode of the organic light emitting diode is connected to a negative voltage of the power source.
  • the working process of the pixel driving circuit includes: a data signal writing phase, a threshold voltage compensation phase, and a lighting phase;
  • the first output end of the scan signal selection circuit outputs a low potential signal, and the second output end outputs a scan signal
  • the first output end and the second output end of the scan signal selection circuit each output a scan signal
  • the first output of the scan signal selection circuit outputs a scan signal, and the second output outputs a low potential signal.
  • the AMOLED display panel includes: a display area, and a non-display area surrounding the display area, the pixel driving circuit is located in the display area, and the scan signal selection circuit is located in the non-display area.
  • the gate driving circuit is a GOA circuit formed in the non-display area or an integrated circuit externally connected to the non-display area.
  • the first control signal and the second control signal are both provided by an external timing controller.
  • the present invention also provides a scan driving system for an AMOLED display panel, comprising: a gate driving circuit, a scanning signal selecting circuit, and a pixel driving circuit;
  • the scan signal selection circuit has a first input end, a second input end, a first control end, a second control end, a first output end, and a second output end; the first input end of the scan signal selection circuit is electrically connected to the gate drive circuit, and the second input end is connected to a low potential signal, first The control end and the second control end respectively connect the first control signal and the second control signal, and the first output end and the second output end are electrically connected to the pixel driving circuit;
  • the gate driving circuit is configured to output a scan signal to a first input end of the scan signal selection circuit
  • the scan signal selection circuit is configured to control the first output end and the second output end to simultaneously output a low potential signal to the pixel driving circuit according to the first control signal and the second control signal, and simultaneously output a scan signal And respectively outputting a low potential signal and a scan signal, or respectively outputting a scan signal and a low potential signal;
  • the first output end and the second output end simultaneously output a low potential signal to the pixel driving circuit
  • the first output end and the second output end respectively output a low potential signal and a scan signal to the pixel driving circuit
  • the first output end and the second output end respectively output a scan signal and a low potential signal to the pixel driving circuit
  • the scan signal selection circuit includes: a first thin film transistor, a second thin film transistor, a third thin film transistor, a fourth thin film transistor, a first inverter, and a second inverter;
  • the gate of the first thin film transistor is electrically connected to the output end of the first inverter, the source is connected to the low potential signal, and the drain is electrically connected to the drain of the second thin film transistor;
  • the gate of the second thin film transistor is electrically connected to the input end of the first inverter, and the source is connected to the scan signal;
  • the gate of the third thin film transistor is electrically connected to the input end of the second inverter, the source is electrically connected to the source of the second thin film transistor, and the drain is electrically connected to the drain of the fourth thin film transistor;
  • the gate of the fourth thin film transistor is electrically connected to the output end of the second inverter, and the source is connected to the low potential signal;
  • the input end of the first inverter and the input end of the second inverter respectively input a first control signal and a second control signal;
  • the pixel driving circuit includes: a fifth thin film transistor, a sixth thin film transistor, a seventh thin film transistor, an eighth thin film transistor, a ninth thin film transistor, a capacitor, and an organic light emitting diode;
  • the gate of the fifth thin film transistor is electrically connected to the first output end of the scan signal selection circuit, the source is connected to the sustain voltage, and the drain is electrically connected to the first end of the capacitor;
  • the gate of the sixth thin film transistor is electrically connected to the second output end of the scan signal selection circuit, the source is connected to the data signal, and the drain is electrically connected to the first end of the capacitor;
  • the gate of the seventh thin film transistor is electrically connected to the second output end of the scan signal selection circuit, the source is electrically connected to the source of the eighth thin film transistor, and the drain is electrically connected to the ninth thin film transistor.
  • the gate of the eighth thin film transistor is electrically connected to the first output end of the scan signal selection circuit, and the drain is connected to the power supply high voltage;
  • the drain of the ninth thin film transistor is electrically connected to the source of the eighth thin film transistor, and the source is electrically connected to the anode of the organic light emitting diode;
  • the second end of the capacitor is electrically connected to the gate of the ninth thin film transistor
  • the cathode of the organic light emitting diode is connected to a negative voltage of the power source
  • the working process of the pixel driving circuit includes: a data signal writing phase, a threshold voltage compensation phase, and a lighting phase;
  • the first output end of the scan signal selection circuit outputs a low potential signal, and the second output end outputs a scan signal
  • the first output end and the second output end of the scan signal selection circuit each output a scan signal
  • the first output of the scan signal selection circuit outputs a scan signal, and the second output outputs a low potential signal.
  • the present invention provides a scan driving system for an AMOLED display panel, comprising: a gate driving circuit, a scanning signal selecting circuit, and a pixel driving circuit; the scanning signal selecting circuit has a first input end and a second An input end, a first control end, a second control end, a first output end, and a second output end; the first input end of the scan signal selection circuit is electrically connected to the gate drive circuit, and the second input end.
  • the first control terminal and the second control terminal are respectively connected to the first control signal and the second control signal, and the first output end and the second output end are electrically connected to the pixel driving circuit;
  • the first control signal and the second control signal control the first output end and the second output end of the scan signal selection circuit to output a low potential signal to the pixel drive circuit, simultaneously output a scan signal, respectively output a low potential signal and scan Signal, or separately output scan signal and low potential signal, so as to reduce the number of output channels of the gate drive circuit while implementing the internal compensation function And increasing the scan control signal
  • FIG. 1 is a schematic block diagram of a scan driving system of an AMOLED display panel of the present invention
  • FIG. 2 is a circuit diagram of a scan signal selection circuit and a pixel drive circuit of a scan driving system of an AMOLED display panel of the present invention
  • FIG. 3 is a timing diagram of a scan driving system of an AMOLED display panel of the present invention.
  • FIG. 4 is a schematic diagram of a data signal writing phase of a scan driving system of an AMOLED display panel of the present invention
  • FIG. 5 is a schematic diagram of a threshold voltage compensation phase of a scan driving system of an AMOLED display panel of the present invention.
  • FIG. 6 is a schematic diagram of a scanning driving system of an AMOLED display panel of the present invention in an illuminating phase.
  • the present invention provides a scan driving system for an AMOLED display panel, comprising: a gate driving circuit 1, a scan signal selecting circuit 2, and a pixel driving circuit 3;
  • the scan signal selection circuit 2 has a first input terminal, a second input terminal, a first control terminal, a second control terminal, a first output terminal, and a second output terminal; a first input of the scan signal selection circuit 2 The second input end is connected to the low potential signal VGL, and the first control end and the second control end respectively access the first control signal SEL1 and the second control signal SEL2, first The output end and the second output end are electrically connected to the pixel driving circuit 3;
  • the gate driving circuit 1 is configured to output a scan signal Gate to a first input end of the scan signal selection circuit 2;
  • the scan signal selection circuit 2 is configured to control the first output end and the second output end to simultaneously output a low potential signal VGL to the pixel driving circuit 3 according to the first control signal SEL1 and the second control signal SEL2.
  • the scan signal Gate is output, the low potential signal VGL and the scan signal Gate are respectively output, or the scan signal Gate and the low potential signal VGL are respectively output.
  • the first control signal SEL1 and the second control signal SEL2 are both low, the first output end and the second output end simultaneously output a low potential signal VGL to the pixel driving circuit 3;
  • the first control signal SEL1 and the second control signal SEL2 are both at a high potential, the first output end and the second output end simultaneously output a scan signal Gate to the pixel driving circuit 3;
  • the first control signal SEL1 When the potential is low and the second control signal SEL2 is high, the first output terminal and the second output terminal respectively output a low potential signal VGL and a scan signal Gate to the pixel driving circuit 3;
  • the control signal SEL1 is at a high potential and the second control signal SEL2 is at a low potential, the first output terminal and the second output terminal respectively output a scan signal Gate and a low potential signal VGL to the pixel drive circuit 3.
  • the scan signal selection circuit 2 may include: a first thin film transistor T1, a second thin film transistor T2, a third thin film transistor T3, and a fourth thin film transistor T4. a first inverter F1 and a second inverter F2;
  • the gate of the first thin film transistor T1 is electrically connected to the output end of the first inverter F1, the source is connected to the low potential signal VGL, and the drain is electrically connected to the drain of the second thin film transistor T2.
  • the gate of the second thin film transistor T2 is electrically connected to the input end of the first inverter F1, the source is connected to the scan signal Gate;
  • the gate of the third thin film transistor T3 is electrically connected to the input of the second inverter F2
  • the source is electrically connected to the source of the second thin film transistor T2, and the drain is electrically connected to the drain of the fourth thin film transistor T4;
  • the gate of the fourth thin film transistor T4 is electrically connected to the second inverter F2
  • the output terminal is connected to the low potential signal VGL; the input end of the first inverter F1 and the input end of the second inverter F2 are respectively connected to the first control signal SEL1 and the second control signal SEL2;
  • the scan signal selection circuit 2 of the present invention is not limited to the circuit structure of the above preferred embodiment in the specific implementation, and other feasible circuit configurations are also implemented as the scan signal selection circuit 2 of the present invention, for example,
  • the first inverter F1 and the second inverter F2 in the above preferred embodiment may be removed, and the second thin film transistor T2 and the third thin film transistor T3 are set to the N type.
  • the thin film transistor, the first thin film transistor T1 and the fourth thin film transistor T4 are provided as P-type thin film transistors, and the function of the scanning signal selection circuit 2 of the present invention can also be implemented, which is not limited in the present invention.
  • the pixel driving circuit 3 includes: a fifth thin film transistor T5, a sixth thin film transistor T6, a seventh thin film transistor T7, and an eighth thin film transistor T8. a ninth thin film transistor T9, a capacitor C1, and an organic light emitting diode D1;
  • the gate of the fifth thin film transistor T5 is electrically connected to the first output end of the scan signal selection circuit 2, the source is connected to the sustain voltage Vsus, and the drain is electrically connected to the first end of the capacitor C1;
  • the gate of the sixth thin film transistor T6 is electrically connected to the second output end of the scan signal selection circuit 2, the source is connected to the data signal Data, and the drain is electrically connected to the first end of the capacitor C1;
  • the gate of the thin film transistor T7 is electrically connected to the second output end of the scan signal selection circuit 2, the source is electrically connected to the source of the eighth thin film transistor T8, and the drain is electrically connected to the ninth thin film transistor T9.
  • the gate of the eighth thin film transistor T8 is electrically connected to the first output end of the scan signal selection circuit 2, the drain is connected to the power supply high voltage Vdd; and the drain of the ninth thin film transistor T9 is electrically Connecting the source of the eighth thin film transistor T8, the source is electrically connected to the anode of the organic light emitting diode D1; the second end of the capacitor C1 is electrically connected to the gate of the ninth thin film transistor T9; the organic light emitting diode D1 The cathode is connected to the power supply negative voltage Vss.
  • the working process of the pixel driving circuit 3 includes a data signal writing phase 100, a threshold voltage compensation phase 200, and an illumination phase 300.
  • the first output end of the scan signal selection circuit 2 outputs a low potential signal VGL, and the second output end outputs a scan signal Gate, correspondingly,
  • the first control signal SEL1 is at a low potential
  • the second control signal SEL2 is at a high potential
  • the first, third, sixth, and seventh thin film transistors T1, T3, T6, and T7 thin film transistors are turned on, the first 2.
  • the fourth, fifth, and eighth thin film transistors T2, T4, T5, and T8 are turned off, and the ninth thin film transistor T9 is short-circuited by the seventh thin film transistor T7 into a diode, and the first node A writes data.
  • the voltage of the second node B becomes VSS+Vth1+Vth2, where VSS is the power supply low voltage, the Vth1 is the threshold voltage of the ninth thin film transistor, and Vth2 is the threshold voltage of the organic light emitting diode D1;
  • the first output end and the second output end of the scan signal selection circuit 2 both output a scan signal Gate, and accordingly, the first control signal SEL1 is at a high potential.
  • the second control signal SEL2 is at a high potential, and the second, third, fifth, sixth, seventh, and eighth thin film transistors T2, T3, T5, T6, T7, and T8 thin film transistors are turned on, The first and fourth thin film transistors T1, T4 are turned off, the ninth thin film transistor T9 is short-circuited by the seventh thin film transistor T7 into a diode, the first node A voltage is written to the sustain voltage Vsus;
  • the first output end of the scan signal selection circuit 2 outputs a scan signal Gate, and the second output end outputs a low potential signal VGL, and accordingly, the first control signal SEL1 is high.
  • the second control signal SEL2 is low, and the second, fourth, fifth, eighth, and ninth thin film transistors T2, T4, T5, T8, T9 thin film transistors are turned on, the first, the first The third, sixth, and seventh thin film transistors T1, T3, T6, and T7 are turned off, and the ninth thin film transistor T9 is short-circuited by the seventh thin film transistor T7 into a diode.
  • the point A voltage is written to the sustain voltage Vsus, and the voltage of the second node B is gradually increased to VSS+Vth1+Vth2+Vsus-Vdata, where Vdata is the voltage of the data signal, and the voltage of the source of the ninth thin film transistor T9 is VSS+Vth2 +f(Data), where f(Data) represents a function with respect to the data signal Data, and characterizes the influence of the data signal Data on the source voltage of the first thin film transistor T1, which can be as needed by those skilled in the art.
  • the current flowing through the organic light emitting diode D1 is:
  • K is a structural parameter of the driving thin film transistor, that is, the ninth thin film transistor T9.
  • the K value is relatively stable, and thus, the current I flowing through the organic light emitting diode D1 and the ninth thin film transistor can be seen.
  • the compensation function is realized, and the threshold voltage variation of the driving thin film transistor can be effectively compensated, so that the display brightness of the AMOLED is relatively uniform, and the display quality is improved.
  • the AMOLED display panel includes: a display area, and a non-display area surrounding the display area, the pixel driving circuit 3 is located in the display area, and the scan signal selection circuit 2 Located in the non-display area.
  • the gate driving circuit 1 is a GOA circuit formed in the non-display area or an integrated circuit externally connected to the non-display area.
  • the first control signal SEL1 and the second control signal SEL2 are both provided by an external timing controller.
  • the present invention provides a scan driving system for an AMOLED display panel, including: a gate driving circuit, a scan signal selecting circuit, and a pixel driving circuit;
  • the scan signal selecting circuit has a first input end and a second input a first input end of the scan signal selection circuit is electrically connected to the gate drive circuit, and a second input end is connected to the first input end, the first control end, the first output end, and the second output end.
  • the first control terminal and the second control terminal are respectively connected to the first control signal and the second control signal, and the first output end and the second output end are electrically connected to the pixel driving circuit;
  • the first control signal and the second control signal control the first output end and the second output end of the scan signal selection circuit to output a low potential signal to the pixel driving circuit, simultaneously output a scan signal, and respectively output a low potential signal and a scan signal Or respectively outputting a scan signal and a low-potential signal, thereby reducing the number of output channels of the gate drive circuit while increasing the internal compensation function,

Abstract

本发明提供一种AMOLED显示面板的扫描驱动系统。该系统包括：栅极驱动电路、扫描信号选择电路、及像素驱动电路；通过所述栅极驱动电路输出扫描信号至所述扫描信号选择电路，并通过所述第一控制信号及第二控制信号，控制扫描信号选择电路的第一输出端和第二输出端向所述像素驱动电路将输出低电位信号、同时输出扫描信号、分别输出低电位信号和扫描信号、或者分别输出扫描信号和低电位信号，从而在实现内补功能的同时，减少对栅极驱动电路输出通道的数量需求，并增加扫描信号选择电路的操控灵活性。

Description

AMOLED显示面板的扫描驱动系统 技术领域
本发明涉及显示技术领域，尤其涉及一种AMOLED显示面板的扫描驱动系统。
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。通常AMOLED像素驱动电路均设有用于驱动有机发光二极管发光的驱动薄膜晶体管，在使用过程中，由于有机发光二级管的老化、以及驱动薄膜晶体管的阈值电压偏移，会导致OLED显示装置的显示质量下降，因此需要在OLED显示装置的使用过程中侦测驱动薄膜晶体管的阈值电压对其进行补偿，从而保证OLED显示装置的显示质量。
AMOLED的补偿技术分为内部补偿和外部补偿两大类，且多数都需要更多的TFT以实现补偿目的，因此，需要更多的扫描驱动信号，尤其是内部补偿技术，栅极驱动电路的设计更是成功的关键，越复杂的内部补偿电路需要越多的扫描信号，而数量庞大的扫描信号需求给驱动芯片(Drive IC)和面板电路设计都带来了严峻的考验，并造成了面板成本的提升。
发明内容
本发明的目的在于提供一种AMOLED显示面板的扫描驱动系统，能够 在实现内补功能的同时，减少对栅极驱动电路输出通道的数量需求。
为实现上述目的，本发明提供了一种AMOLED显示面板的扫描驱动系统，包括：栅极驱动电路、扫描信号选择电路、及像素驱动电路；
所述扫描信号选择电路具有第一输入端、第二输入端、第一控制端、第二控制端、第一输出端、及第二输出端；所述扫描信号选择电路的第一输入端与所述栅极驱动电路电性连接，第二输入端接入低电位信号，第一控制端和第二控制端分别接入第一控制信号及第二控制信号，第一输出端和第二输出端均与所述像素驱动电路电性连接；
所述栅极驱动电路，用于输出扫描信号至所述扫描信号选择电路的第一输入端；
所述扫描信号选择电路，用于根据所述第一控制信号及第二控制信号，控制所述第一输出端和第二输出端向所述像素驱动电路同时输出低电位信号、同时输出扫描信号、分别输出低电位信号和扫描信号、或者分别输出扫描信号和低电位信号。
当所述第一控制信号和第二控制信号均为低电位时，所述第一输出端和第二输出端向所述像素驱动电路同时输出低电位信号；
当所述第一控制信号和第二控制信号均为高电位时，所述第一输出端和第二输出端向所述像素驱动电路同时输出扫描信号；
当所述第一控制信号为低电位且所述第二控制信号为高电位时，所述第一输出端和第二输出端向所述像素驱动电路分别输出低电位信号和扫描信号；
当所述第一控制信号为高电位且所述第二控制信号为低电位时，所述第一输出端和第二输出端向所述像素驱动电路分别输出扫描信号和低电位信号。
所述扫描信号选择电路包括：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、第一反相器、及第二反相器；
所述第一薄膜晶体管的栅极电性连接第一反相器的输出端，源极接入低电位信号，漏极电性连接第二薄膜晶体管的漏极；
所述第二薄膜晶体管的栅极电性连接第一反相器的输入端，源极接入扫描信号；
所述第三薄膜晶体管的栅极电性连接第二反相器的输入端，源极电性连接第二薄膜晶体管的源极，漏极电性连接第四薄膜晶体管的漏极；
所述第四薄膜晶体管的栅极电性连接第二反相器的输出端，源极接入低电位信号；
所述第一反相器的输入端和第二反相器的输入端分别接入第一控制信号和第二控制信号。
所述像素驱动电路包括：第五薄膜晶体管、第六薄膜晶体管、第七薄膜晶体管、第八薄膜晶体管、第九薄膜晶体管、电容、及有机发光二极管；
所述第五薄膜晶体管的栅极电性连接所述扫描信号选择电路的第一输出端，源极接入维持电压，漏极电性连接电容的第一端；
所述第六薄膜晶体管的栅极电性连接所述扫描信号选择电路的第二输出端，源极接入数据信号，漏极电性连接电容的第一端；
所述第七薄膜晶体管的栅极电性连接所述扫描信号选择电路的第二输出端，源极电性连接第八薄膜晶体管的源极，漏极电性连接电性连接第九薄膜晶体管的栅极；
所述第八薄膜晶体管的栅极电性连接所述扫描信号选择电路的第一输出端，漏极接入电源高电压；
所述第九薄膜晶体管的漏极电性连接所述第八薄膜晶体管的源极，源极电性连接有机发光二极管的阳极；
所述电容的第二端电性连接第九薄膜晶体管的栅极；
所述有机发光二极管的阴极接入电源负电压。
所述像素驱动电路的工作过程依次包括：数据信号写入阶段、阈值电压补偿阶段、及发光阶段；
在所述数据信号写入阶段，所述扫描信号选择电路的第一输出端输出低电位信号，第二输出端输出扫描信号；
在阈值电压补偿阶段，所述扫描信号选择电路的第一输出端和第二输出端均输出扫描信号；
在发光阶段，所述扫描信号选择电路的第一输出端输出扫描信号，第二输出端输出低电位信号。
所述AMOLED显示面板包括：显示区、及包围所述显示区的非显示区，所述像素驱动电路位于所述显示区内，所述扫描信号选择电路位于所述非显示区内。
所述栅极驱动电路为形成于所述非显示区内的GOA电路或外接于所述非显示区上的集成电路。
所述第一控制信号及第二控制信号均通过外部时序控制器提供。
本发明还提供一种AMOLED显示面板的扫描驱动系统，包括：栅极驱动电路、扫描信号选择电路、及像素驱动电路；
所述扫描信号选择电路具有第一输入端、第二输入端、第一控制端、 第二控制端、第一输出端、及第二输出端；所述扫描信号选择电路的第一输入端与所述栅极驱动电路电性连接，第二输入端接入低电位信号，第一控制端和第二控制端分别接入第一控制信号及第二控制信号，第一输出端和第二输出端均与所述像素驱动电路电性连接；
所述栅极驱动电路，用于输出扫描信号至所述扫描信号选择电路的第一输入端；
所述扫描信号选择电路，用于根据所述第一控制信号及第二控制信号，控制所述第一输出端和第二输出端向所述像素驱动电路同时输出低电位信号、同时输出扫描信号、分别输出低电位信号和扫描信号、或者分别输出扫描信号和低电位信号；
其中，
当所述第一控制信号和第二控制信号均为低电位时，所述第一输出端和第二输出端向所述像素驱动电路同时输出低电位信号；
当所述第一控制信号和第二控制信号均为高电位时，所述第一输出端和第二输出端向所述像素驱动电路同时输出扫描信号；
当所述第一控制信号为低电位且所述第二控制信号为高电位时，所述第一输出端和第二输出端向所述像素驱动电路分别输出低电位信号和扫描信号；
当所述第一控制信号为高电位且所述第二控制信号为低电位时，所述第一输出端和第二输出端向所述像素驱动电路分别输出扫描信号和低电位信号；
其中，所述扫描信号选择电路包括：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、第一反相器、及第二反相器；
所述第一薄膜晶体管的栅极电性连接第一反相器的输出端，源极接入低电位信号，漏极电性连接第二薄膜晶体管的漏极；
所述第二薄膜晶体管的栅极电性连接第一反相器的输入端，源极接入扫描信号；
所述第三薄膜晶体管的栅极电性连接第二反相器的输入端，源极电性连接第二薄膜晶体管的源极，漏极电性连接第四薄膜晶体管的漏极；
所述第四薄膜晶体管的栅极电性连接第二反相器的输出端，源极接入低电位信号；
所述第一反相器的输入端和第二反相器的输入端分别接入第一控制信号和第二控制信号；
其中，所述像素驱动电路包括：第五薄膜晶体管、第六薄膜晶体管、 第七薄膜晶体管、第八薄膜晶体管、第九薄膜晶体管、电容、及有机发光二极管；
所述第五薄膜晶体管的栅极电性连接所述扫描信号选择电路的第一输出端，源极接入维持电压，漏极电性连接电容的第一端；
所述第六薄膜晶体管的栅极电性连接所述扫描信号选择电路的第二输出端，源极接入数据信号，漏极电性连接电容的第一端；
所述第七薄膜晶体管的栅极电性连接所述扫描信号选择电路的第二输出端，源极电性连接第八薄膜晶体管的源极，漏极电性连接电性连接第九薄膜晶体管的栅极；
所述第八薄膜晶体管的栅极电性连接所述扫描信号选择电路的第一输出端，漏极接入电源高电压；
所述第九薄膜晶体管的漏极电性连接所述第八薄膜晶体管的源极，源极电性连接有机发光二极管的阳极；
所述电容的第二端电性连接第九薄膜晶体管的栅极；
所述有机发光二极管的阴极接入电源负电压；
其中，所述像素驱动电路的工作过程依次包括：数据信号写入阶段、阈值电压补偿阶段、及发光阶段；
在所述数据信号写入阶段，所述扫描信号选择电路的第一输出端输出低电位信号，第二输出端输出扫描信号；
在阈值电压补偿阶段，所述扫描信号选择电路的第一输出端和第二输出端均输出扫描信号；
在发光阶段，所述扫描信号选择电路的第一输出端输出扫描信号，第二输出端输出低电位信号。
本发明的有益效果：本发明提供一种AMOLED显示面板的扫描驱动系统，包括：栅极驱动电路、扫描信号选择电路、及像素驱动电路；所述扫描信号选择电路具有第一输入端、第二输入端、第一控制端、第二控制端、第一输出端、及第二输出端；所述扫描信号选择电路的第一输入端与所述栅极驱动电路电性连接，第二输入端接入低电位信号，第一控制端和第二控制端分别接入第一控制信号及第二控制信号，第一输出端和第二输出端均与所述像素驱动电路电性连接；通过所述第一控制信号及第二控制信号，控制扫描信号选择电路的第一输出端和第二输出端向所述像素驱动电路将输出低电位信号、同时输出扫描信号、分别输出低电位信号和扫描信号、或者分别输出扫描信号和低电位信号，从而在实现内补功能的同时，减少对栅极驱动电路输出通道的数量需求，并增加扫描信号选择电路的操控灵 活性。
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为本发明的AMOLED显示面板的扫描驱动系统的模块示意图；
图2为本发明的AMOLED显示面板的扫描驱动系统的扫描信号选择电路和像素驱动电路的电路图；
图3为本发明的AMOLED显示面板的扫描驱动系统的时序图；
图4为本发明的AMOLED显示面板的扫描驱动系统的在数据信号写入阶段的示意图；
图5为本发明的AMOLED显示面板的扫描驱动系统的在阈值电压补偿阶段的示意图；
图6为本发明的AMOLED显示面板的扫描驱动系统的在发光阶段的示意图。
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1，本发明提供一种AMOLED显示面板的扫描驱动系统，包括：栅极驱动电路1、扫描信号选择电路2、及像素驱动电路3；
所述扫描信号选择电路2具有第一输入端、第二输入端、第一控制端、第二控制端、第一输出端、及第二输出端；所述扫描信号选择电路2的第一输入端与所述栅极驱动电路1电性连接，第二输入端接入低电位信号VGL，第一控制端和第二控制端分别接入第一控制信号SEL1及第二控制信号SEL2，第一输出端和第二输出端均与所述像素驱动电路3电性连接；
所述栅极驱动电路1，用于输出扫描信号Gate至所述扫描信号选择电路2的第一输入端；
所述扫描信号选择电路2，用于根据所述第一控制信号SEL1及第二控制信号SEL2，控制所述第一输出端和第二输出端向所述像素驱动电路3同时输出低电位信号VGL、同时输出扫描信号Gate、分别输出低电位信号VGL和扫描信号Gate、或者分别输出扫描信号Gate和低电位信号VGL。
具体地，当所述第一控制信号SEL1和第二控制信号SEL2均为低电位时，所述第一输出端和第二输出端向所述像素驱动电路3同时输出低电位信号VGL；当所述第一控制信号SEL1和第二控制信号SEL2均为高电位时，所述第一输出端和第二输出端向所述像素驱动电路3同时输出扫描信号Gate；当所述第一控制信号SEL1为低电位且所述第二控制信号SEL2为高电位时，所述第一输出端和第二输出端向所述像素驱动电路3分别输出低电位信号VGL和扫描信号Gate；当所述第一控制信号SEL1为高电位且所述第二控制信号SEL2为低电位时，所述第一输出端和第二输出端向所述像素驱动电路3分别输出扫描信号Gate和低电位信号VGL。
优选地，在本发明的优选实施例中，请参阅图2，所述扫描信号选择电路2可包括：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、第一反相器F1、及第二反相器F2；
其中，所述第一薄膜晶体管T1的栅极电性连接第一反相器F1的输出端，源极接入低电位信号VGL，漏极电性连接第二薄膜晶体管T2的漏极；所述第二薄膜晶体管T2的栅极电性连接第一反相器F1的输入端，源极接入扫描信号Gate；所述第三薄膜晶体管T3的栅极电性连接第二反相器F2的输入端，源极电性连接第二薄膜晶体管T2的源极，漏极电性连接第四薄膜晶体管T4的漏极；所述第四薄膜晶体管T4的栅极电性连接第二反相器F2的输出端，源极接入低电位信号VGL；所述第一反相器F1的输入端和第二反相器F2的输入端分别接入第一控制信号SEL1和第二控制信号SEL2；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以及第四薄膜晶体管T4都为N型薄膜晶体管。
应当理解的是，本发明的扫描信号选择电路2在具体实施时，并不限于上述优选实施例的电路结构，其他可行的电路结构也属于作为本发明的扫描信号选择电路2进行实施，例如，在本发明的其他实施例中，可以将上述优选实施例中的第一反相器F1、及第二反相器F2去掉，并将第二薄膜晶体管T2和第三薄膜晶体管T3设置为N型薄膜晶体管，第一薄膜晶体管T1和第四薄膜晶体管T4设置为P型薄膜晶体管，也可以实现本发明的扫描信号选择电路2的功能，本发明对此不做限制。
具体地，请继续参阅图2，在本发明的优选实施例中，所述像素驱动电路3包括：第五薄膜晶体管T5、第六薄膜晶体管T6、第七薄膜晶体管T7、第八薄膜晶体管T8、第九薄膜晶体管T9、电容C1、及有机发光二极管D1；
其中，所述第五薄膜晶体管T5的栅极电性连接所述扫描信号选择电路2的第一输出端，源极接入维持电压Vsus，漏极电性连接电容C1的第一端； 所述第六薄膜晶体管T6的栅极电性连接所述扫描信号选择电路2的第二输出端，源极接入数据信号Data，漏极电性连接电容C1的第一端；所述第七薄膜晶体管T7的栅极电性连接所述扫描信号选择电路2的第二输出端，源极电性连接第八薄膜晶体管T8的源极，漏极电性连接电性连接第九薄膜晶体管T9的栅极；所述第八薄膜晶体管T8的栅极电性连接所述扫描信号选择电路2的第一输出端，漏极接入电源高电压Vdd；所述第九薄膜晶体管T9的漏极电性连接所述第八薄膜晶体管T8的源极，源极电性连接有机发光二极管D1的阳极；所述电容C1的第二端电性连接第九薄膜晶体管T9的栅极；所述有机发光二极管D1的阴极接入电源负电压Vss。
需要说明的是，如图3所示，上述优选实施例中，所述像素驱动电路3的工作过程依次包括：数据信号写入阶段100、阈值电压补偿阶段200、及发光阶段300。
其中，如图4所示，在所述数据信号写入阶段100，所述扫描信号选择电路2的第一输出端输出低电位信号VGL，第二输出端输出扫描信号Gate，相应地，所述第一控制信号SEL1为低电位，所述第二控制信号SEL2为高电位，所述第一、第三、第六、及第七薄膜晶体管T1、T3、T6、T7薄膜晶体管打开，所述第二、第四、第五、及第八薄膜晶体管T2、T4、T5、T8薄膜晶体管关闭，第九薄膜晶体管T9被所述第七薄膜晶体管T7短路为二极管，所述第一节点A写入数据信号Data，第二节点B的电压变为VSS+Vth1+Vth2，其中VSS为电源低电压，所述Vth1为第九薄膜晶体管的阈值电压，Vth2为有机发光二极管D1的阈值电压；
如图5所示，在阈值电压补偿阶段200，所述扫描信号选择电路2的第一输出端和第二输出端均输出扫描信号Gate，相应地，所述第一控制信号SEL1为高电位，所述第二控制信号SEL2为高电位，所述第二、第三、第五、第六、第七、及第八薄膜晶体管T2、T3、T5、T6、T7、T8薄膜晶体管打开，所述第一及第四薄膜晶体管T1、T4关闭，第九薄膜晶体管T9被所述第七薄膜晶体管T7短路为二极管，所述第一节点A电压写入维持电压Vsus；
如图6所示，在发光阶段300，所述扫描信号选择电路2的第一输出端输出扫描信号Gate，第二输出端输出低电位信号VGL，相应地，所述第一控制信号SEL1为高电位，所述第二控制信号SEL2为低电位，所述第二、第四、第五、第八及第九薄膜晶体管T2、T4、T5、T8、T9薄膜晶体管打开，所述第一、第三、第六、及第七薄膜晶体管T1、T3、T6、T7关闭，第九薄膜晶体管T9被所述第七薄膜晶体管T7短路为二极管，所述第一节 点A电压写入维持电压Vsus，第二节点B的电压逐渐上升至VSS+Vth1+Vth2+Vsus-Vdata，其中Vdata为数据信号的电压，第九薄膜晶体管T9的源极的电压为VSS+Vth2+f(Data)，其中，、f(Data)表示一关于数据信号Data的函数，表征数据信号Data对所述第一薄膜晶体管T1的源极电压所产生的影响，本领域技术人员可据需要采用相应的已知函数，流过有机发光二极管D1的电流为：
I＝K[(VSS+Vth1+Vth2+Vsus-Vdata)–(VSS+Vth2+f(Data))-Vth1]2
＝K[Vsus-VData-f(Data)]2，
K为驱动薄膜晶体管也即第九薄膜晶体管T9的结构参数，对于相同结构的薄膜晶体管，K值相对稳定，由此可见，流经所述有机发光二极管D1的电流I与所述第九薄膜晶体管T9的阈值电压、有机发光二极管D1的阈值电压无关，实现了补偿功能，能够有效补偿驱动薄膜晶体管的阈值电压变化，使AMOLED的显示亮度较均匀，提升显示品质。
具体地，如图1所示，所述AMOLED显示面板包括：显示区、及包围所述显示区的非显示区，所述像素驱动电路3位于所述显示区内，所述扫描信号选择电路2位于所述非显示区内。可选地，所述栅极驱动电路1为形成于所述非显示区内的GOA电路或外接于所述非显示区上的集成电路。
具体地，所述第一控制信号SEL1及第二控制信号SEL2均通过外部时序控制器提供。
综上所述，本发明提供一种AMOLED显示面板的扫描驱动系统，包括：栅极驱动电路、扫描信号选择电路、及像素驱动电路；所述扫描信号选择电路具有第一输入端、第二输入端、第一控制端、第二控制端、第一输出端、及第二输出端；所述扫描信号选择电路的第一输入端与所述栅极驱动电路电性连接，第二输入端接入低电位信号，第一控制端和第二控制端分别接入第一控制信号及第二控制信号，第一输出端和第二输出端均与所述像素驱动电路电性连接；通过所述第一控制信号及第二控制信号，控制扫描信号选择电路的第一输出端和第二输出端向所述像素驱动电路将输出低电位信号、同时输出扫描信号、分别输出低电位信号和扫描信号、或者分别输出扫描信号和低电位信号，从而在实现内补功能的同时，减少对栅极驱动电路输出通道的数量需求，并增加扫描信号选择电路的操控灵活性。
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 (12)

  1. 一种AMOLED显示面板的扫描驱动系统，包括：栅极驱动电路、扫描信号选择电路、及像素驱动电路；
    所述扫描信号选择电路具有第一输入端、第二输入端、第一控制端、第二控制端、第一输出端、及第二输出端；所述扫描信号选择电路的第一输入端与所述栅极驱动电路电性连接，第二输入端接入低电位信号，第一控制端和第二控制端分别接入第一控制信号及第二控制信号，第一输出端和第二输出端均与所述像素驱动电路电性连接；
    所述栅极驱动电路，用于输出扫描信号至所述扫描信号选择电路的第一输入端；
    所述扫描信号选择电路，用于根据所述第一控制信号及第二控制信号，控制所述第一输出端和第二输出端向所述像素驱动电路同时输出低电位信号、同时输出扫描信号、分别输出低电位信号和扫描信号、或者分别输出扫描信号和低电位信号。
  2. 如权利要求1所述的AMOLED显示面板的扫描驱动系统，其中，
    当所述第一控制信号和第二控制信号均为低电位时，所述第一输出端和第二输出端向所述像素驱动电路同时输出低电位信号；
    当所述第一控制信号和第二控制信号均为高电位时，所述第一输出端和第二输出端向所述像素驱动电路同时输出扫描信号；
    当所述第一控制信号为低电位且所述第二控制信号为高电位时，所述第一输出端和第二输出端向所述像素驱动电路分别输出低电位信号和扫描信号；
    当所述第一控制信号为高电位且所述第二控制信号为低电位时，所述第一输出端和第二输出端向所述像素驱动电路分别输出扫描信号和低电位信号。
  3. 如权利要求1所述的AMOLED显示面板的扫描驱动系统，其中，所述扫描信号选择电路包括：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、第一反相器、及第二反相器；
    所述第一薄膜晶体管的栅极电性连接第一反相器的输出端，源极接入低电位信号，漏极电性连接第二薄膜晶体管的漏极；
    所述第二薄膜晶体管的栅极电性连接第一反相器的输入端，源极接入扫描信号；
    所述第三薄膜晶体管的栅极电性连接第二反相器的输入端，源极电性连接第二薄膜晶体管的源极，漏极电性连接第四薄膜晶体管的漏极；
    所述第四薄膜晶体管的栅极电性连接第二反相器的输出端，源极接入低电位信号；
    所述第一反相器的输入端和第二反相器的输入端分别接入第一控制信号和第二控制信号。
  4. 如权利要求1所述的AMOLED显示面板的扫描驱动系统，其中，所述像素驱动电路包括：第五薄膜晶体管、第六薄膜晶体管、第七薄膜晶体管、第八薄膜晶体管、第九薄膜晶体管、电容、及有机发光二极管；
    所述第五薄膜晶体管的栅极电性连接所述扫描信号选择电路的第一输出端，源极接入维持电压，漏极电性连接电容的第一端；
    所述第六薄膜晶体管的栅极电性连接所述扫描信号选择电路的第二输出端，源极接入数据信号，漏极电性连接电容的第一端；
    所述第七薄膜晶体管的栅极电性连接所述扫描信号选择电路的第二输出端，源极电性连接第八薄膜晶体管的源极，漏极电性连接电性连接第九薄膜晶体管的栅极；
    所述第八薄膜晶体管的栅极电性连接所述扫描信号选择电路的第一输出端，漏极接入电源高电压；
    所述第九薄膜晶体管的漏极电性连接所述第八薄膜晶体管的源极，源极电性连接有机发光二极管的阳极；
    所述电容的第二端电性连接第九薄膜晶体管的栅极；
    所述有机发光二极管的阴极接入电源负电压。
  5. 如权利要求4所述的AMOLED显示面板的扫描驱动系统，其中，所述像素驱动电路的工作过程依次包括：数据信号写入阶段、阈值电压补偿阶段、及发光阶段；
    在所述数据信号写入阶段，所述扫描信号选择电路的第一输出端输出低电位信号，第二输出端输出扫描信号；
    在阈值电压补偿阶段，所述扫描信号选择电路的第一输出端和第二输出端均输出扫描信号；
    在发光阶段，所述扫描信号选择电路的第一输出端输出扫描信号，第二输出端输出低电位信号。
  6. 如权利要求1所述的AMOLED显示面板的扫描驱动系统，其中，所述AMOLED显示面板包括：显示区、及包围所述显示区的非显示区，所述像素驱动电路位于所述显示区内，所述扫描信号选择电路位于所述非显 示区内。
  7. 如权利要求6所述的AMOLED显示面板的扫描驱动系统，其中，所述栅极驱动电路为形成于所述非显示区内的GOA电路或外接于所述非显示区上的集成电路。
  8. 如权利要求1所述的AMOLED显示面板的扫描驱动系统，其中，所述第一控制信号及第二控制信号均通过外部时序控制器提供。
  9. 一种AMOLED显示面板的扫描驱动系统，包括：栅极驱动电路、扫描信号选择电路、及像素驱动电路；
    所述扫描信号选择电路具有第一输入端、第二输入端、第一控制端、第二控制端、第一输出端、及第二输出端；所述扫描信号选择电路的第一输入端与所述栅极驱动电路电性连接，第二输入端接入低电位信号，第一控制端和第二控制端分别接入第一控制信号及第二控制信号，第一输出端和第二输出端均与所述像素驱动电路电性连接；
    所述栅极驱动电路，用于输出扫描信号至所述扫描信号选择电路的第一输入端；
    所述扫描信号选择电路，用于根据所述第一控制信号及第二控制信号，控制所述第一输出端和第二输出端向所述像素驱动电路同时输出低电位信号、同时输出扫描信号、分别输出低电位信号和扫描信号、或者分别输出扫描信号和低电位信号；
    其中，
    当所述第一控制信号和第二控制信号均为低电位时，所述第一输出端和第二输出端向所述像素驱动电路同时输出低电位信号；
    当所述第一控制信号和第二控制信号均为高电位时，所述第一输出端和第二输出端向所述像素驱动电路同时输出扫描信号；
    当所述第一控制信号为低电位且所述第二控制信号为高电位时，所述第一输出端和第二输出端向所述像素驱动电路分别输出低电位信号和扫描信号；
    当所述第一控制信号为高电位且所述第二控制信号为低电位时，所述第一输出端和第二输出端向所述像素驱动电路分别输出扫描信号和低电位信号；
    其中，所述扫描信号选择电路包括：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、第一反相器、及第二反相器；
    所述第一薄膜晶体管的栅极电性连接第一反相器的输出端，源极接入低电位信号，漏极电性连接第二薄膜晶体管的漏极；
    所述第二薄膜晶体管的栅极电性连接第一反相器的输入端，源极接入扫描信号；
    所述第三薄膜晶体管的栅极电性连接第二反相器的输入端，源极电性连接第二薄膜晶体管的源极，漏极电性连接第四薄膜晶体管的漏极；
    所述第四薄膜晶体管的栅极电性连接第二反相器的输出端，源极接入低电位信号；
    所述第一反相器的输入端和第二反相器的输入端分别接入第一控制信号和第二控制信号；
    其中，所述像素驱动电路包括：第五薄膜晶体管、第六薄膜晶体管、第七薄膜晶体管、第八薄膜晶体管、第九薄膜晶体管、电容、及有机发光二极管；
    所述第五薄膜晶体管的栅极电性连接所述扫描信号选择电路的第一输出端，源极接入维持电压，漏极电性连接电容的第一端；
    所述第六薄膜晶体管的栅极电性连接所述扫描信号选择电路的第二输出端，源极接入数据信号，漏极电性连接电容的第一端；
    所述第七薄膜晶体管的栅极电性连接所述扫描信号选择电路的第二输出端，源极电性连接第八薄膜晶体管的源极，漏极电性连接电性连接第九薄膜晶体管的栅极；
    所述第八薄膜晶体管的栅极电性连接所述扫描信号选择电路的第一输出端，漏极接入电源高电压；
    所述第九薄膜晶体管的漏极电性连接所述第八薄膜晶体管的源极，源极电性连接有机发光二极管的阳极；
    所述电容的第二端电性连接第九薄膜晶体管的栅极；
    所述有机发光二极管的阴极接入电源负电压；
    其中，所述像素驱动电路的工作过程依次包括：数据信号写入阶段、阈值电压补偿阶段、及发光阶段；
    在所述数据信号写入阶段，所述扫描信号选择电路的第一输出端输出低电位信号，第二输出端输出扫描信号；
    在阈值电压补偿阶段，所述扫描信号选择电路的第一输出端和第二输出端均输出扫描信号；
    在发光阶段，所述扫描信号选择电路的第一输出端输出扫描信号，第二输出端输出低电位信号。
  10. 如权利要求9所述的AMOLED显示面板的扫描驱动系统，其中，所述AMOLED显示面板包括：显示区、及包围所述显示区的非显示区，所 述像素驱动电路位于所述显示区内，所述扫描信号选择电路位于所述非显示区内。
  11. 如权利要求10所述的AMOLED显示面板的扫描驱动系统，其中，所述栅极驱动电路为形成于所述非显示区内的GOA电路或外接于所述非显示区上的集成电路。
  12. 如权利要求9所述的AMOLED显示面板的扫描驱动系统，其中，所述第一控制信号及第二控制信号均通过外部时序控制器提供。
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