WO2019109690A1 - 像素驱动电路、有机发光显示面板及像素驱动方法 - Google Patents

像素驱动电路、有机发光显示面板及像素驱动方法 Download PDF

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Publication number
WO2019109690A1
WO2019109690A1 PCT/CN2018/104197 CN2018104197W WO2019109690A1 WO 2019109690 A1 WO2019109690 A1 WO 2019109690A1 CN 2018104197 W CN2018104197 W CN 2018104197W WO 2019109690 A1 WO2019109690 A1 WO 2019109690A1
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Prior art keywords
transistor
circuit
sub
signal line
organic light
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PCT/CN2018/104197
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English (en)
French (fr)
Inventor
马俊才
李丹丹
王立森
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京东方科技集团股份有限公司
合肥京东方光电科技有限公司
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Priority to US16/327,629 priority Critical patent/US11289004B2/en
Publication of WO2019109690A1 publication Critical patent/WO2019109690A1/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
    • G09G3/2092—Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3266—Details of drivers for scan electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms
    • G09G2310/061—Details of flat display driving waveforms for resetting or blanking
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to a pixel driving circuit, an organic light emitting display panel, and a pixel driving method.
  • An organic light emitting diode is an active light emitting device whose structure is similar to a "sandwich structure".
  • the structure of the OELD shown in FIG. 1 is composed of a multilayer film, including a lining.
  • the OLED emits light by applying a voltage between the anode 11 and the cathode 17, in which the interface exists between the hole transport layer 13 and the organic light-emitting layer 14 and between the organic light-emitting layer 14 and the electron transport layer 15, Holes (positively charged positive charges) that do not enter the organic light-emitting layer 14 are collected at the interface between the hole transport layer 13 and the organic light-emitting layer 14, at the interface between the organic light-emitting layer 14 and the electron transport layer 15. The electrons (negatively charged) that do not enter the organic light-emitting layer 14 are collected, and the electrons or holes block other electrons or holes from entering the organic light-emitting layer 14. As the OLED emits longer, more and more electrons will be generated.
  • the holes gather at the interface, and the collected electrons and holes form a built-in electric field on both sides of the organic light-emitting layer 14, hinder the recombination of electrons and holes, affect the luminous efficiency of the OLED, reduce the brightness of the OLED, and reduce the lifetime of the OLED.
  • the present disclosure provides a pixel driving circuit, an organic light emitting display panel, and a pixel driving method.
  • a pixel driving circuit including:
  • a switching sub-circuit the control end of which is connected to the first scanning signal line, the first end of which is connected to the data signal line, and the second end of which is connected to the control end of the driving sub-circuit for writing the data voltage output by the data signal line;
  • a driving sub-circuit the first end of which is connected to the power voltage end, and the second end of which is connected to the anode of the organic light emitting element for driving the organic light emitting element to emit light under the control of the switch sub circuit;
  • a storage capacitor having one end connected to the control end of the driving sub-circuit and the other end connected to the first end of the driving sub-circuit for storing a data voltage output by the data signal line;
  • control end is connected to the second scan signal line, and the other ends are respectively connected to the first end of the driving sub-circuit, the cathode of the organic light emitting element and the reference voltage end, for the second scanning signal line
  • the control end is connected to the second scan signal line
  • other ends are respectively connected to the first end of the driving sub-circuit, the cathode of the organic light emitting element and the reference voltage end, for the second scanning signal line
  • the potential between the anode and the cathode of the organic light-emitting element is reversed under the control.
  • the pixel driving circuit further includes:
  • a gate voltage reset sub-circuit the control end of which is connected to the third scan signal line, and the other ends are respectively connected to the cathode of the organic light-emitting element, the control end of the driving sub-circuit and the reference voltage end for the third scanning signal line
  • the gate voltage of the driving sub-circuit is reset under control.
  • the first scan signal line is a scan signal line of the row
  • the second scan signal line and the third scan signal line are both scan signal lines of the previous row.
  • the switch sub-circuit includes a first transistor having a gate of the first transistor as its control terminal, and a first pole of the first transistor as its first end, the first The second pole of the transistor serves as its second end.
  • the driving sub-circuit includes a second transistor having a gate of the second transistor as its control terminal, a first electrode of the second transistor as a first end thereof, and a second transistor The pole serves as its second end.
  • the charge elimination sub-circuit includes a third transistor and a fourth transistor, wherein
  • a gate of the third transistor and a gate of the fourth transistor are connected as a control end thereof to a second scan signal line;
  • a first pole of the third transistor is connected to a first pole of the second transistor, and a second pole of the third transistor is connected to a cathode of the organic light emitting element;
  • the first pole of the fourth transistor is connected to the cathode of the organic light emitting element, and the second pole of the fourth transistor is connected to the reference voltage terminal.
  • the gate voltage reset subcircuit includes a fifth transistor and a sixth transistor;
  • a gate of the sixth transistor as a control terminal thereof, a first electrode of the sixth transistor is connected to a cathode of the organic light emitting element, and a second electrode of the sixth transistor is connected to a gate of the fifth transistor;
  • the first pole of the fifth transistor is connected to the gate of the second transistor, and the second pole of the fifth transistor is connected to the reference voltage terminal.
  • one of the third transistor and the fourth transistor is an N-type transistor and the other is a P-type transistor.
  • the fifth transistor and the sixth transistor are both N-type transistors or both P-type transistors.
  • an organic light emitting display panel includes a plurality of pixel units, a plurality of scanning signal lines, and a plurality of data signal lines, and an area defined by the intersection of the scanning signal lines and the data signal lines constitutes each of A pixel unit, each of which includes an organic light emitting element and a pixel driving circuit as described in any of the above.
  • a pixel circuit driving method is provided, which is applied to any of the pixel driving circuits described above, and the driving method includes:
  • the data voltage output from the data signal line is written to the storage capacitor by the first scan signal line control switch sub-circuit and stored, and the organic light-emitting element is driven to emit light by the drive sub-circuit control.
  • the method further includes:
  • the gate voltage of the driving sub-circuit is reset by controlling the gate voltage reset sub-circuit through the third scanning signal line.
  • the pixel driving circuit writes the data voltage outputted by the data signal line through the switch sub-circuit, and further converts the data voltage into a current signal through the driving sub-circuit, and drives the organic light-emitting element to emit light through the driving sub-circuit, and
  • the presence of a storage capacitor stores the data voltage written by the switch subcircuit, maintaining the organic light emitting element to continue to emit light for the period of time it is displayed.
  • the charge eliminating sub-circuit reverses the potential between the anode and the cathode of the organic light emitting element under the control of the second scanning signal line, and after the potential is reversed, the electrons are concentrated in the electron due to the reverse electric field between the anode and the cathode of the organic light emitting element.
  • the electrons at the interface between the transport layer and the organic light-emitting layer return to the electron transport layer, and the holes accumulated at the interface between the hole transport layer and the organic light-emitting layer return to the hole transport layer, thereby eliminating the interface Most of the electrons and holes avoid the accumulation and accumulation of holes and electrons at the above two interface locations.
  • FIG. 1 is a schematic structural view of a known OLED device
  • FIG. 2 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present disclosure
  • FIG. 3 is a schematic structural view of a known pixel driving circuit
  • FIG. 4 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the present disclosure.
  • FIG. 5 is a schematic structural diagram of a pixel driving circuit according to still another embodiment of the present disclosure.
  • FIG. 6 is a signal timing diagram of a driving method of the pixel driving circuit shown in FIG. 5;
  • FIG. 7 is a flowchart of a pixel driving method according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic diagram of a display panel according to an embodiment of the present disclosure.
  • the embodiment of the present disclosure provides a pixel driving circuit, which can solve the problem that the existing organic light emitting diode OLED has low luminous efficiency and low lifetime.
  • the circuit includes:
  • the switch sub-circuit 10 has a control terminal connected to the first scan signal line G1, a first end connected to the data signal line D, and a second end connected to the control end of the drive sub-circuit 11 for writing data outputted by the data signal line D. Voltage;
  • the driving sub-circuit 11 has a first end connected to the power supply voltage terminal VDD and a second end connected to the anode of the organic light emitting element 12 for driving the organic light emitting element 12 to emit light under the control of the switching sub circuit 10;
  • a storage capacitor C having one end connected to the control end of the driving sub-circuit 11 and the other end connected to the first end of the driving sub-circuit 11 for storing the data voltage output by the data signal line D;
  • the charge eliminating sub-circuit 13 has a control terminal connected to the second scanning signal line G2, and the other ends are respectively connected to the first end of the driving sub-circuit 11, the cathode of the organic light emitting element 12, and the reference voltage terminal VSS for use in the second
  • the potential between the anode and the cathode of the organic light emitting element 12 is reversed under the control of the scanning signal line G2.
  • the above organic light emitting element may be an organic light emitting diode OLED or other light emitting device that emits light by emitting electron and hole excitation light emitting layers.
  • the pixel driving circuit of the embodiment writes the data voltage outputted by the data signal line through the switch sub-circuit, and further converts the data voltage into a current signal through the driving sub-circuit, drives the organic light-emitting element to emit light through the driving sub-circuit, and due to the storage capacitor There is, a data voltage written by the switch sub-circuit can be stored, maintaining the organic light-emitting element to continue to emit light for the period of time it is displayed.
  • the charge eliminating sub-circuit reverses the potential between the anode and the cathode of the organic light emitting element under the control of the second scanning signal line
  • the potential inversion refers to an electric field formed between the anode and the cathode of the organic light emitting element and the organic light emitting element
  • the direction of the electric field formed is opposite. For example, when the organic light-emitting element emits light, the potential of the anode is higher than the potential of the cathode, and the direction of the electric field at this time is directed from the anode to the cathode. When the potential is reversed, the potential of the anode is lower than the potential of the cathode. The direction of the electric field at this time is directed from the cathode to the anode.
  • the electrons accumulated at the interface between the electron transport layer and the organic light-emitting layer are returned to the electron transport layer due to the reverse electric field between the anode and the cathode of the organic light-emitting element, and are accumulated in the hole transport layer and organic.
  • the holes at the interface between the light-emitting layers return to the hole transport layer, thereby eliminating most of the electrons and holes at the interface, and avoiding the accumulation and accumulation of holes and electrons at the above two interface positions, thereby solving The problem that the organic light-emitting element drives the light for a long time causes the luminous efficiency to rapidly decrease, the luminous efficiency is improved, and the service life of the organic light-emitting element is improved.
  • the conventional pixel driving circuit is usually 2T1C, that is, two thin film transistors plus one capacitor structure, as shown in FIG. 3, is a 2T1C pixel driving circuit structure, including a first transistor T1, a second transistor T2, and a capacitor C S , first The transistor T1 is a switching transistor, the second transistor T2 is a driving transistor, and the capacitor C S is a storage capacitor.
  • the gate of the first transistor T1 is connected to the scan signal line G N for inputting a row scan signal
  • the source is connected to the data signal line D N for inputting a data signal
  • the drain and the gate and capacitor of the second transistor T2 are used.
  • One end of C S is connected;
  • the source of the second transistor T2 is connected to the power supply voltage terminal VDD,
  • the drain is electrically connected to the anode of the OLED, the cathode of the OLED is connected to the reference voltage end; and one end of the capacitor C S is connected to the drain of the first thin film transistor T1 The other end is connected to the source of the second transistor T2.
  • the above pixel driving circuit includes two working periods in each frame time, and the specific working process is:
  • the first period is the data voltage V data writing period t1 during which, for example, the first transistor T1 is turned on by the scanning signal line input high-potential scanning signal, and the data voltage V data of the data signal output by the data signal line is passed through A transistor T1 enters the gate of the second transistor T2 and the capacitor C S , the data voltage V data is written to the storage capacitor Cs, and the data signal acts on the gate of the second transistor T2, and the second transistor T2 is turned on.
  • the driving current outputted by the second transistor T2 drives the OLED to emit light;
  • the second period is a display maintaining period t2 during which the scan signal line outputs a low potential signal, the gate of the first transistor T1 is at a low potential, and the first transistor T1 is turned off. Due to the storage of the capacitor Cs, the second transistor T2 The gate voltage can still maintain the data voltage V data , so that the second transistor T2 is in an on state, and the driving current enters the OLED through the second transistor T2 to drive the OLED to emit light until the next frame of the high potential scanning signal arrives, first Transistor T1 is turned on again.
  • the gate voltage reset sub-circuit 14 has a control terminal connected to the third scan signal line G3, and the other ends are respectively connected to the cathode of the organic light-emitting element 12, the control terminal of the driving sub-circuit 11 and the reference voltage terminal VSS for use in the third
  • the gate voltage of the driving sub-circuit 11 is reset under the control of the scanning signal line G3.
  • the gate voltage of the driving sub-circuit is reset by the gate voltage reset sub-circuit, so that the gate voltage of the driving sub-circuit is not biased in a fixed direction, thereby improving
  • the first scan signal line is the scan signal line of the row
  • the second scan signal line and the third scan signal line are the scan signal lines of the previous row of the scan signal line of the row.
  • a pixel unit of a matrix distribution is generally included, and includes a plurality of scanning signal lines and a plurality of data signal lines, and regions defined by intersections of the scanning signal lines and the data signal lines constitute respective pixel units, each of which
  • the pixel unit includes an organic light emitting element and a pixel driving circuit.
  • the plurality of pixel units in the same row are connected to the corresponding scanning signal lines, and the plurality of pixel units in the same column are connected to the corresponding data signal lines, and the screen is displayed on the display panel. Scanning is used.
  • the scanning signal is input to the scanning signal lines of each row from top to bottom, and the data signals are input to the data signal lines of each column from left to right, and the scanning time of one frame is completed.
  • the scan time of the line scan signal line that is, the scan time of all the data signal lines is completed.
  • the scanning signal line of the present line refers to a scanning signal line connected to a pixel driving circuit in the pixel unit
  • the data signal line described above is a data signal line of the current line connected to the pixel driving circuit in the pixel unit.
  • the second scanning signal line and the third scanning signal line are the same scanning signal line, which are the scanning signals of the upper row of the scanning signal line of the current line, and the scanning signal line of the previous row is used to control the charge eliminating sub-circuit and the gate voltage reset.
  • the working state of the sub-circuit can use the scanning signal outputted by the scanning signal line of the previous row to provide a scanning signal to each pixel driving circuit of the previous row, and the potential of the anode and the cathode of the organic light-emitting component in the pixel driving circuit of the row is reversed.
  • the luminous efficiency of the organic light-emitting element improves the display effect of the screen, and does not require a separate scanning signal line, which simplifies the control mode of the pixel driving circuit, and can reduce the number of scanning signal lines and increase the aperture ratio of the display device.
  • the second scan signal line and the third scan signal line may also be scan signal lines that individually control the operation states of the charge elimination sub-circuit and the gate voltage reset sub-circuit, or the first scan signal line, the second scan signal line, and
  • the third scanning signal line is the scanning signal line of the current line, or the first scanning signal line is the scanning signal line of the current line, and the second scanning signal line and the third scanning signal line are other scanning signal lines, which is not disclosed in the present disclosure. limited.
  • the pixel drive circuit can be controlled by time-division input of the scan signal, for example, in the first For a period of time, the scan signal outputted by the scan signal line of the current line controls the charge elimination sub-circuit and the gate voltage reset sub-circuit to operate, and the potentials of the anode and cathode of the organic light-emitting element are reversed and the gate voltage of the driving sub-circuit is reset.
  • the scanning signal outputted by the scanning signal line of the current line controls the switching sub-circuit and the driving sub-circuit to operate in the second period to cause the organic light-emitting element to emit light.
  • the pixel driving circuit includes a switching sub-circuit, a driving sub-circuit, a storage capacitor, a charge eliminating sub-circuit, and a gate voltage reset sub-circuit, wherein
  • the switch sub-circuit comprises a first transistor T1, the gate of the first transistor T1 as its control terminal, connected to the first scan signal line (shown as the scan signal line G N in the figure), the first pole of the first transistor T1 As its first end, the first pole is connected to the data signal line (shown as the current data signal line D N ), the second pole of the first transistor T1 serves as its second end, and the second pole is connected to the second transistor T2 Gate
  • the driving sub-circuit includes a second transistor T2 having a gate as its control terminal connected to the second electrode of the first transistor T1, and a first electrode of the second transistor T2 as its first end, the first pole is connected a power supply voltage terminal VDD, a second electrode of the second transistor T2 as its second end, and a second electrode connected to an anode of the organic light emitting element (shown as an organic light emitting diode OLED);
  • the charge eliminating sub-circuit includes a third transistor T3 and a fourth transistor T4; the gate of the third transistor T3 and the gate of the fourth transistor T4 are connected as their control terminals to the second scanning signal line (the upper row is shown in the figure) Signal line G N-1 );
  • the first electrode of the third transistor T3 is connected to the first end of the driving transistor (the first pole of the second transistor T2 shown in the drawing), and the second electrode of the third transistor T3 is connected to the organic light emitting element (shown in the figure) Cathode connection of OLED);
  • the first pole of the fourth transistor T4 is connected to the cathode of the organic light emitting element (OLED shown in the figure), and the second pole of the fourth transistor T4 is connected to the reference voltage terminal VSS;
  • the gate voltage reset sub-circuit includes a fifth transistor T5 and a sixth transistor T6; the gate of the sixth transistor T6 serves as its control terminal, and the gate is connected to the third scan signal line (the upper scan signal line G N shown in the figure) -1 ), the first pole of the sixth transistor T6 is connected to the cathode of the organic light emitting element (OLED shown in the figure), and the second pole of the sixth transistor T6 is connected to the gate of the fifth transistor T5;
  • the first electrode of the fifth transistor T5 is connected to the control terminal of the driving transistor T2, and the second electrode of the fifth transistor T5 is connected to the reference voltage terminal VSS.
  • the first transistor, the second transistor, the third transistor, the fifth transistor, and the sixth transistor are all N-type transistors, and the fourth transistor is a P-type transistor, and the pixel driving is described below as an example.
  • the driving method of the circuit of course, the type of each of the above transistors may be set as needed, and is not limited to the mode described in the embodiment.
  • the pole is the second extremely drain.
  • the power supply voltage terminal VDD described above is at a high potential
  • the reference voltage terminal VSS is at a low potential.
  • the first working period t1 which reverses the potential between the anode and the cathode of the OLED and resets the gate voltage of the driving transistor, for example, the scanning signal line G N- of the previous row 1 outputting a scan signal, which is a high-potential signal, while supplying a scan signal to the pixel unit of the previous row
  • the gates of the third transistor T3 and the sixth transistor T6 are at a high potential
  • the third transistor T3 and the sixth transistor T6 are turned on
  • the fourth transistor T4 is a P-type transistor, at this time, the fourth transistor T4 is turned off, and since the third transistor T3 is turned on, the voltage of the power supply voltage terminal VDD is loaded to the cathode of the OLED through the third transistor T3, since the fourth transistor T4 is turned off.
  • the OLED is disconnected from the reference voltage terminal VSS, so that the cathode of the OLED is at a high potential, and the anode potential of the OLED is smaller than the cathode potential, and the potential between the anode and the cathode of the OLED is reversed, eliminating most of the interface at the OLED. Electrons and holes, avoiding the accumulation and accumulation of holes and electrons at the above two interface positions;
  • the gate of the sixth transistor T6 is a high potential signal
  • the sixth transistor T6 is turned on, and the high potential of the cathode of the OLED is transmitted to the gate of the fifth transistor T5 through the second pole of the sixth transistor T6, thereby making the fifth transistor T5 is turned on, the first electrode of the fifth transistor T5 is connected to the gate of the second transistor T2, the second electrode of the fifth transistor T5 is connected to the reference voltage terminal VSS, and the gate potential of the second transistor T2 is pulled down to the reference voltage The low potential of the terminal VSS, thereby resetting the gate voltage of the second transistor T2, improving the threshold voltage Vth drift problem of the second transistor T2;
  • the second working period includes t2 and t3, which is an OLED display stage.
  • the scan signal outputted by the scan signal line G N-1 of the previous row is a low potential signal
  • the scan signal output by the scan signal line G N of the current line is high.
  • a potential signal at this time, the gate of the first transistor T1 is at a high potential, the first transistor T1 is turned on, and the data voltage V data of the data signal outputted by the current data signal line D N is loaded to the second transistor through the first transistor T1.
  • the scan signal outputted by the scan signal line G N of the current line is a low potential signal, and the first transistor T1 is turned off. Due to the storage function of the storage capacitor Cs, the gate voltage of the second transistor T2 can continue to maintain the data voltage V. Data , so that the second transistor T2 is in an on state, and still has a driving current entering the OLED, driving the OLED to emit light until the scanning signal output from the scanning signal line G N of the next frame of the next frame comes, and the first transistor T1 is turned on again.
  • the pixel driving circuit controls the potential of the anode and the cathode of the OLED to be reversed and the gate voltage of the second transistor as the driving transistor to be reset by the scanning signal line of the previous row.
  • the corresponding control signals are outputted through the scanning signal lines according to the types of the transistors, thereby controlling the turning on or off of the transistors, for example, if the third transistor and the fifth transistor are used.
  • the transistor and the sixth transistor are P-type transistors, and the fourth transistor is an N-type transistor.
  • the scanning signal line of the upper row can output a low potential signal to control the third transistor, the fifth transistor and the sixth transistor to be turned on, and the fourth transistor is turned off.
  • the first transistor and the second transistor are P-type transistors, the first transistor and the second transistor are controlled to be turned on by the scan signal output low-potential signal, and the driving method and working process of the pixel driving circuit are similar to those described above. , will not repeat them here.
  • the second working period is first performed, that is, the periods t2 and t3, and then the first working period, that is, the period t1, if In the time-sharing mode, the first working period may be performed first, then the second working period may be performed, or the second working period may be performed first, and then the first working period is performed, regardless of the order in which the working principle is The descriptions of the above embodiments are the same, and the working process will not be described again.
  • An embodiment of the present disclosure further provides an organic light emitting display panel, as shown in FIG. 8, which includes a plurality of pixel units 130, a plurality of scanning signal lines 140, and a plurality of data signal lines 150.
  • the scanning signal lines and the data signal lines are cross-defined.
  • the area constitutes each pixel unit 130, and each pixel unit includes an organic light emitting element and the pixel driving circuit described in any of the above embodiments.
  • the organic light-emitting display panel can eliminate most of the electrons at the interface between the electron transport layer and the organic light-emitting layer accumulated in the organic light-emitting element and accumulate in the hole transport layer due to the pixel driving circuit provided by the embodiment of the present disclosure.
  • the holes at the interface between the organic light-emitting layers prevent the holes and electrons from collecting and accumulating at the above two interface positions, thereby solving the problem that the luminous efficiency is rapidly lowered as the organic light-emitting element drives the light for a long time, thereby improving the luminous efficiency.
  • the life of the organic light emitting element is improved, and the screen display effect of the organic light emitting display panel can be improved.
  • the embodiment of the present disclosure further provides a pixel circuit driving method, which is applied to the pixel driving circuit described in any of the above embodiments. As shown in FIG. 7, the driving method includes:
  • the scan signal input through the second scan signal line controls the switch sub-circuit to write the data voltage outputted by the data signal line of the current line to the storage capacitor and store, and the organic light-emitting element is driven to emit light by the drive sub-circuit control.
  • the driving method further includes:
  • the gate voltage of the driving sub-circuit is reset by controlling the gate voltage reset sub-circuit through the first scanning signal line.
  • the driving method of the pixel circuit provided by the embodiment of the present disclosure is used to drive the pixel driving circuit of the above embodiment, which can solve the problem that the luminous efficiency is rapidly reduced as the organic light emitting element drives the light for a long time, thereby improving the luminous efficiency and improving the organic The service life of the light-emitting element.
  • connection refers to electrical connection, and both ends of the interconnection can pass an electrical signal.

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Abstract

公开了一种像素驱动电路、有机发光显示面板及像素驱动方法，该驱动电路包括：开关子电路（10）、驱动子电路（11）、存储电容（C）和电荷消除子电路（13），其中，电荷消除子电路（13），其控制端与第一扫描信号线（GN-1）连接，其他各端分别与所述驱动子电路（11）的第一端、有机发光元件（OLED）的阴极和参考电压端（VSS）连接，用于在第一扫描信号线（GN-1）的控制下使有机发光元件的阳极和阴极之间的电势反置。该驱动电路可提高有机发光元件发光效率，同时提高其使用寿命。

Description

像素驱动电路、有机发光显示面板及像素驱动方法
本申请要求于2017年12月8日递交的第201711292875.3号中国专利申请的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。
技术领域
本公开涉及显示技术领域，尤其涉及像素驱动电路、有机发光显示面板及像素驱动方法。
背景技术
有机发光二极管OLED(Organic Light Emitting Diode，简称OLED)为一种主动发光的器件，其结构为类似“三明治结构”，如图1所示的OELD的结构，由多层薄膜组成，包括设置在衬底基板10上的阳极11、空穴注入层12、空穴传输层13、有机发光层14、电子传输层15、电子注入层16和阴极17等。
通过在阳极11和阴极17之间施加电压控制OLED发光，该OLED的结构中，在空穴传输层13与有机发光层14之间以及有机发光层14与电子传输层15之间由于存在界面，在空穴传输层13与有机发光层14之间的界面处会聚集未进入有机发光层14的空穴(空穴带正电荷)，在有机发光层14与电子传输层15之间的界面处会聚集未进入有机发光层14的电子(电子带负电荷)，该电子或者空穴会阻挡其他电子或者空穴进入有机发光层14，随着OLED发光时间加长，会使越来越多的电子或者空穴聚集在界面处，聚集的电子和空穴会在有机发光层14两侧形成内建电场，阻碍电子和空穴的复合，影响OLED发光效率，使OLED发光亮度降低，OLED寿命降低。
发明内容
本公开提供一种像素驱动电路、有机发光显示面板及像素驱动方法。
根据本公开实施例，提供一种像素驱动电路，包括：
开关子电路，其控制端连接第一扫描信号线，其第一端连接数据信号线，其第二端连接驱动子电路的控制端，用于写入数据信号线输出的数据电压；
驱动子电路，其第一端连接电源电压端，其第二端与有机发光元件的阳极连接，用于在所述开关子电路控制下驱动有机发光元件发光；
存储电容，其一端与所述驱动子电路的控制端连接，其另一端连接所述驱动子电路的第一端，用于存储数据信号线输出的数据电压；
电荷消除子电路，其控制端与第二扫描信号线连接，其他各端分别与所述驱动子电路的第一端、有机发光元件的阴极和参考电压端连接，用于在第二扫描信号线的控制下使有机发光元件的阳极和阴极之间的电势反置。
根据本公开的一实施例，该像素驱动电路还包括：
栅极电压复位子电路，其控制端连接第三扫描信号线，其他各端分别与有机发光元件的阴极、所述驱动子电路的控制端和参考电压端连接，用于在第三扫描信号线控制下对所述驱动子电路的栅极电压进行复位。
根据本公开的一实施例，所述第一扫描信号线为本行扫描信号线，所述第二扫描信号线和第三扫描信号线均为上一行扫描信号线。
根据本公开的一实施例，所述开关子电路包括第一晶体管，所述第一晶体管的栅极作为其控制端，所述第一晶体管的第一极作为其第一端，所述第一晶体管的第二极作为其第二端。
可选的，所述驱动子电路包括第二晶体管，所述第二晶体管的栅极作为其控制端，所述第二晶体管的第一极作为其第一端，所述第二晶体管的第二极作为其第二端。
可选的，所述电荷消除子电路包括第三晶体管和第四晶体管，其中，
所述第三晶体管的栅极和所述第四晶体管的栅极作为其控制端连接第二扫描信号线；
所述第三晶体管的第一极与所述第二晶体管的第一极连接，所述第三 晶体管的第二极与有机发光元件的阴极连接；
所述第四晶体管的第一极与所述有机发光元件的阴极连接，所述第四晶体管的第二极与参考电压端连接。
可选的，所述栅极电压复位子电路包括第五晶体管和第六晶体管；
所述第六晶体管的栅极作为其控制端，所述第六晶体管的第一极与有机发光元件的阴极连接，所述第六晶体管的第二极与第五晶体管的栅极连接；
所述第五晶体管的第一极与所述第二晶体管的栅极连接，所述第五晶体管的第二极与参考电压端连接。
根据本公开的一实施例，所述第三晶体管和所述第四晶体管其中之一为N型晶体管，另一个为P型晶体管。
根据本公开的一实施例，所述第五晶体管和所述第六晶体管均为N型晶体管或者均为P型晶体管。
根据本公开实施例，提供一种有机发光显示面板，包括多个像素单元、多条扫描信号线和多条数据信号线，所述扫描信号线和所述数据信号线交叉限定的区域构成各所述像素单元，每个像素单元包括有机发光元件和上述任一所述的像素驱动电路。
根据本公开实施例，提供一种像素电路驱动方法，应用于上述任一所述的像素驱动电路，所述驱动方法包括:
通过第二扫描信号线输入的扫描信号控制电荷消除子电路使有机发光元件的阳极和阴极之间的电势反置；
通过第一扫描信号线控制开关子电路将数据信号线输出的数据电压写入存储电容并存储，且通过驱动子电路控制驱动有机发光元件发光。
根据本公开的一实施例，还包括：
通过第三扫描信号线控制栅极电压复位子电路对驱动子电路的栅极电压进行复位。
根据上述实施例可知，该像素驱动电路，通过开关子电路写入数据信号线输出的数据电压，进而通过驱动子电路将数据电压转化成电流信号，通过驱动子电路驱动有机发光元件发光，且由于存储电容的存在，可存储通过开关子电路写入的数据电压，维持有机发光元件在其显示的时间段内持续发光。
电荷消除子电路在第二扫描信号线控制下使有机发光元件的阳极和阴极 之间的电势反置，电势反置后由于有机发光元件的阳极和阴极之间的反向电场，使聚集在电子传输层与有机发光层之间界面处的电子重新回到电子传输层，聚集在空穴传输层与有机发光层之间界面处的空穴重新回到空穴传输层，因此，可消除界面处的大部分电子和空穴，避免空穴和电子在上述两界面位置处聚集和累积。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性和解释性的，并不能限制本发明。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对实施例的附图作简单地介绍，显而易见地，下面描述的附图仅仅涉及本公开的一些实施例，而非对本公开的限制。
图1是一种已知的OLED器件的结构示意图；
图2是根据本公开一实施例示出的像素驱动电路的结构示意图；
图3是一种已知的像素驱动电路的结构示意图；
图4是根据本公开另一实施例示出的像素驱动电路的结构示意图；
图5是根据本公开又一实施例示出的像素驱动电路的结构示意图；
图6为图5所示像素驱动电路的驱动方法的信号时序图；
图7是根据本公开一实施例示出的像素驱动方法的流程图；以及
图8是根据本公开一实施例示出的显示面板的示意图。
具体实施方式
这里将详细地对示例性实施例进行说明，其示例表示在附图中。下面的描述涉及附图时，除非另有表示，不同附图中的相同数字表示相同或相似的要素。以下示例性实施例中所描述的实施方式并不代表与本公开相一致的所有实施方式。相反，它们仅是与如所附权利要求书中所详述的、本公开的一些方面相一致的装置和方法的例子。
本公开实施例提供一种像素驱动电路，可以解决现有有机发光二极管OLED发光效率低和寿命低的问题，如图2所示，该电路包括：
开关子电路10，其控制端连接第一扫描信号线G1，其第一端连接数据信号线D，其第二端连接驱动子电路11的控制端，用于写入数据信号线D输出的数据电压；
驱动子电路11，其第一端连接电源电压端VDD，其第二端与有机发光元件12的阳极连接，用于在开关子电路10控制下驱动有机发光元件12发光；
存储电容C，其一端与所述驱动子电路11的控制端连接，其另一端连接驱动子电路11的第一端，用于存储数据信号线D输出的数据电压；
电荷消除子电路13，其控制端与第二扫描信号线G2连接，其他各端分别与驱动子电路11的第一端、有机发光元件12的阴极和参考电压端VSS连接，用于在第二扫描信号线G2的控制下使有机发光元件12的阳极和阴极之间的电势反置。
上述的有机发光元件可以为有机发光二极管OLED或者其他通过电子和空穴激发发光层进行发光的发光器件。
本实施例的像素驱动电路，通过开关子电路写入数据信号线输出的数据电压，进而通过驱动子电路将数据电压转化成电流信号，通过驱动子电路驱动有机发光元件发光，且由于存储电容的存在，可存储通过开关子电路写入的数据电压，维持有机发光元件在其显示的时间段内持续发光。
电荷消除子电路在第二扫描信号线控制下使有机发光元件的阳极和阴极之间的电势反置，电势反置是指使有机发光元件的阳极和阴极之间形成的电场与有机发光元件发光时的形成的电场方向相反，例如，当有机发光元件发光时，阳极的电位高于阴极的电位，此时的电场方向由阳极指向阴极，当电势反置后，阳极的电位低于阴极的电位，此时的电场方向由阴极指向阳极。
电势反置后由于有机发光元件的阳极和阴极之间的反向电场，使聚集在电子传输层与有机发光层之间界面处的电子重新回到电子传输层，聚集在空穴传输层与有机发光层之间界面处的空穴重新回到空穴传输层，因此，可消除界面处的大部分电子和空穴，避免空穴和电子在上述两界面位置处聚集和累积，从而解决随着对有机发光元件长时间驱动发光导致其发光效率快速降低的问题，提高发光效率，同时提高有机发光元件的使用寿命。
传统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，如图3所示，为2T1C的像素驱动电路结构，包括第一晶体管T1、第二晶体管T2及电容C S，第一晶体管T1为开关晶体管，第二晶体管 T2为驱动晶体管，电容C S为存储电容。
例如，第一晶体管T1的栅极连接扫描信号线G N，用于输入行扫描信号，源极连接数据信号线D N，用于输入数据信号，漏极与第二晶体管T2的栅极及电容C S的一端连接；第二晶体管T2的源极连接电源电压端VDD，漏极电性连接OLED的阳极，OLED的阴极连接参考电压端；电容C S的一端连接第一薄膜晶体管T1的漏极，另一端连接第二晶体管T2的源极。
上述的像素驱动电路在每帧时间内包括两个工作时段，具体工作过程为：
第一时段为数据电压V data写入时段t1，在该时段内，例如，通过扫描信号线输入高电位扫描信号控制第一晶体管T1开启，数据信号线输出的数据信号的数据电压V data经过第一晶体管T1进入到第二晶体管T2的栅极及电容C S，数据电压V data写入到存储电容器Cs上，同时数据信号作用于第二晶体管T2的栅极，第二晶体管T2导通，通过第二晶体管T2输出的驱动电流驱动OLED发光；
第二时段为显示维持时段t2，在该时段内，扫描信号线输出低电位信号，第一晶体管T1的栅极为低电位，第一晶体管T1关断，由于电容Cs的存储作用，第二晶体管T2的栅极电压仍可继续保持数据电压V data，使得第二晶体管T2处于导通状态，驱动电流通过第二晶体管T2进入OLED，驱动OLED发光，直到下一帧的高电位扫描信号到来，第一晶体管T1再次开启。
在上述2T1C的像素驱动电路中的驱动晶体管T2因其栅极电位一直向固定方向偏压，导致驱动晶体管的阈值电压Vth逐渐上升变大，而OLED的驱动电流Ioled＝K*(Vgs-Vth) 2，由于阈值电压Vth增大导致OLED的驱动电流逐渐下降，驱动电流下降导致OLED发光效率降低。
针对上述驱动晶体管栅极电位偏压问题，如图4所示，本公开实施例的像素驱动电路在图2的基础上，还可以包括：
栅极电压复位子电路14，其控制端连接第三扫描信号线G3，其他各端分别与有机发光元件12的阴极、驱动子电路11的控制端和参考电压端VSS连接，用于在第三扫描信号线G3控制下对驱动子电路11的栅极电压进行复位。
本实施例中，在第三扫描信号线的控制下，通过栅极电压复位子电路对驱动子电路的栅极电压进行复位，使驱动子电路的栅极电压不会向固定方向偏压，改善驱动子电路的阈值电压Vth逐渐上升变大的问题，改善阈值电压Vth漂移问题，进而提高OLED的驱动电流的稳定性，使发光亮度均匀，改善采用该像素驱动电路的OLED显示装置显示画面的显示效果。
在一个实施方式中，第一扫描信号线为本行扫描信号线，第二扫描信号线和第三扫描信号线均为本行扫描信号线的上一行扫描信号线。
在采用有机发光元件的显示面板中，通常包括矩阵分布的像素单元，并且包括多条扫描信号线和多条数据信号线，扫描信号线和数据信号线交叉限定的区域构成各像素单元，每个像素单元包括有机发光元件和像素驱动电路，位于同一行的多个像素单元与对应的扫描信号线相连，位于同一列的多个像素单元与对应的数据信号线相连，在显示面板进行画面显示时，采用扫描的方式，例如，自上而下依次向每一行的扫描信号线输入扫描信号，同时自左向右依次向每一列的数据信号线输入数据信号，一帧画面的扫描时间为完成所有行扫描信号线的扫描时间，也就是完成所有的数据信号线的扫描时间。
本行扫描信号线指与该像素单元中的像素驱动电路连接的扫描信号线，上述所述的数据信号线是与该像素单元中的像素驱动电路连接的本行数据信号线。
例如，第二扫描信号线和第三扫描信号线为同一条扫描信号线，均为本行扫描信号线的上一行扫描信号线，采用上一行扫描信号线控制电荷消除子电路和栅极电压复位子电路的工作状态，可利用上一行扫描信号线输出的扫描信号对上一行的各像素驱动电路提供扫描信号的同时，使本行像素驱动电路中的有机发光元件的阳极和阴极的电势反置和驱动子电路的栅极电压复位，这样可以每帧画面的扫描时间为固定周期进行电势反置和栅极电压复位，可以周期性的消除空穴和电子在两界面位置处聚集和累积，提高有机发光元件的发光效率，改善画面的显示效果，并且不需要单独的设置扫描信号线，可简化像素驱动电路的控制方式，且可减少扫描信号线的数量，提高显示装置的开口率。
上述的第二扫描信号线和第三扫描信号线也可以为单独控制电荷消除子电路和栅极电压复位子电路的工作状态的扫描信号线，或者第一扫描 信号线、第二扫描信号线和第三扫描信号线均为本行扫描信号线，或者第一扫描信号线为本行扫描信号线，第二扫描信号线和第三扫描信号线为其他行扫描信号线，本公开对此并不限定。
需要说明的是，如果第一扫描信号线、第二扫描信号线和第三扫描信号线均为本行扫描信号线，可通过分时输入扫描信号的方式控制像素驱动电路工作，例如，在第一时段，使本行扫描信号线输出的扫描信号控制电荷消除子电路和栅极电压复位子电路工作，将有机发光元件的阳极和阴极的电势反置和对驱动子电路的栅极电压复位，在第二时段使本行扫描信号线输出的扫描信号控制开关子电路和驱动子电路工作，使有机发光元件发光。
图5所示为本公开实施例提供的一种像素驱动电路的结构，图6所示为图5所示像素驱动电路的驱动方法的信号时序图，如图5所示，该像素驱动电路包括开关子电路、驱动子电路、存储电容、电荷消除子电路和栅极电压复位子电路，其中，
开关子电路包括第一晶体管T1，第一晶体管T1的栅极作为其控制端，连接第一扫描信号线(图中所示为本行扫描信号线G N)，第一晶体管T1的第一极作为其第一端，第一极连接数据信号线(图中所示为本行数据信号线D N)，第一晶体管T1的第二极作为其第二端，第二极连接第二晶体管T2的栅极；
驱动子电路包括第二晶体管T2，第二晶体管T2的栅极作为其控制端，与第一晶体管T1的第二极连接，第二晶体管T2的第一极作为其第一端，第一极连接电源电压端VDD，第二晶体管T2的第二极作为其第二端，第二极与有机发光元件(图示所示为有机发光二极管OLED)的阳极连接；
电荷消除子电路包括第三晶体管T3和第四晶体管T4；第三晶体管T3的栅极和第四晶体管T4的栅极作为其控制端均连接第二扫描信号线(图中所示为上一行扫描信号线G N-1)；
第三晶体管T3的第一极与驱动晶体管的第一端(图中所示的第二晶体管T2的第一极)连接，第三晶体管T3的第二极与有机发光元件(图中所示的OLED)的阴极连接；
第四晶体管T4的第一极与有机发光元件(图中所示OLED)的阴极连接，第四晶体管T4的第二极与参考电压端VSS连接；
栅极电压复位子电路包括第五晶体管T5和第六晶体管T6；第六晶体管T6的栅极作为其控制端，栅极连接第三扫描信号线(图中所示的上一行扫描信号线G N-1)，第六晶体管T6的第一极与有机发光元件(图中所示OLED)的阴极连接，第六晶体管T6的第二极与第五晶体管T5的栅极连接；
第五晶体管T5的第一极与驱动晶体管T2的控制端连接，第五晶体管T5的第二极与参考电压端VSS连接。
上述像素驱动电路中，例如，第一晶体管、第二晶体管、第三晶体管、第五晶体管和第六晶体管均为N型晶体管，第四晶体管为P型晶体管，下面以此为例说明该像素驱动电路的驱动方法，当然，也可以根据需要设置上述各晶体管的类型，并不限于本实施例所述的方式。
上述所述的各晶体管的第一极为漏极或源极，第二极为源极或漏极中的另一极，即若第一极为漏极，则第二极为源极，若第一极为源极，则第二极为漏极。
例如，上述所述的电源电压端VDD为高电位，而参考电压端VSS为低电位，该像素驱动电路工作时，可分为两个工作时段：
如图5和图6所示，第一工作时段t1，该时段对OLED的阳极和阴极之间的电势反置和对驱动晶体管的栅极电压进行复位，例如，上一行扫描信号线G N-1输出扫描信号，为高电位信号，对上一行的像素单元提供扫描信号的同时，第三晶体管T3和第六晶体管T6的栅极为高电位，第三晶体管T3和第六晶体管T6开启，同时，由于第四晶体管T4为P型晶体管，此时，第四晶体管T4关断，由于第三晶体管T3打开，电源电压端VDD的电压通过第三晶体管T3加载至OLED的阴极，由于第四晶体管T4关断，OLED与参考电压端VSS的通路断开，使得OLED的阴极为高电位，而OLED的阳极电位小于阴极电位，OLED的阳极和阴极之间的电势反置，消除OLED的界面处的大部分电子和空穴，避免空穴和电子在上述两界面位置处聚集和累积；
同时，由于第六晶体管T6的栅极为高电位信号，第六晶体管T6开启，OLED的阴极的高电位通过第六晶体管T6的第二极传输到第五晶体管T5的栅极，从而使第五晶体管T5开启，第五晶体管T5的第一极连接至第二晶体管T2的栅极，第五晶体管T5的第二极连接至参考电压端VSS，将第二晶体管T2的栅极电位拉低至参考电压端VSS的低电位，进而对第二晶体管T2 的栅极电压进行复位，改善第二晶体管T2的阈值电压Vth漂移问题；
第二工作时段包括t2和t3，为OLED显示阶段，在时段t2，上一行扫描信号线G N-1输出的扫描信号为低电位信号，而本行扫描信号线G N输出的扫描信号为高电位信号，此时，第一晶体管T1的栅极为高电位，第一晶体管T1开启，并且，本行数据信号线D N输出的数据信号的数据电压V data经过第一晶体管T1加载到第二晶体管T2的栅极及存储电容C S，数据电压V data写入到存储电容器Cs上，同时作用于第二晶体管T2的栅极，第二晶体管T2导通，通过第二晶体管T2输出的驱动电流驱动OLED发光；
在时段t3，本行扫描信号线G N输出的扫描信号为低电位信号，第一晶体管T1关断，由于存储电容Cs的存储作用，第二晶体管T2的栅极电压仍可继续保持数据电压V data，使得第二晶体管T2处于导通状态，仍然有驱动电流进入OLED，驱动OLED发光，直到下一帧的本行扫描信号线G N输出的扫描信号到来，第一晶体管T1再次开启。
由上述像素驱动电路的工作过程可知，该像素驱动电路通过上一行扫描信号线控制对OLED的阳极和阴极之间的电势进行反置和对作为驱动晶体管的第二晶体管的栅极电压复位。当然，如果各晶体管的类型不同，只要根据上述工作过程，根据各晶体管的类型通过扫描信号线输出对应的控制信号进而控制各晶体管的开启或者关断即可，例如，如果第三晶体管、第五晶体管和第六晶体管为P型晶体管，第四晶体管为N型晶体管，此时上一行扫描信号线可输出低电位信号控制第三晶体管、第五晶体管和第六晶体管开启，第四晶体管关断，如果第一晶体管和第二晶体管为P型晶体管，可通过本行扫描信号输出低电位信号控制第一晶体管和第二晶体管开启，像素驱动电路的驱动方法和工作过程与上述描述的同理可推，此处不再赘述。
上述工作过程描述时是以自上而下的顺序进行扫描描述的，分为时段t1、时段t2和t3，但是本公开并不限定各时段的前后顺序，像素驱动电路并不一定必然按照上述的各时段的顺序进行驱动和工作，例如，若是以自下而上的顺序进行扫描，则先进行第二工作时段，即时段t2和t3，然后再进行第一工作时段，即时段t1，如果采用分时驱动的方式，则可一先进行第一工作时段，然后再进行第二工作时段，或者先进行第二工作时段，然后再进行第一工作 时段，不管按照何种顺序，其工作原理与上述实施例描述的相同，再次不再赘述工作过程。
本公开实施例还提供一种有机发光显示面板，如图8所示，其包括多个像素单元130、多条扫描信号线140和多条数据信号线150，扫描信号线和数据信号线交叉限定的区域构成各像素单元130，每个像素单元包括有机发光元件和上述任一实施例所述的像素驱动电路。
该有机发光显示面板，由于采用本公开实施例提供的像素驱动电路，可消除聚集在有机发光元件中的电子传输层与有机发光层之间界面处的大部分电子和聚集在空穴传输层与有机发光层之间界面处的空穴，避免空穴和电子在上述两界面位置处聚集和累积，从而解决随着对有机发光元件长时间驱动发光导致其发光效率快速降低的问题，提高发光效率，同时提高有机发光元件的使用寿命，可改善有机发光显示面板的画面显示效果。
本公开实施例还提供一种像素电路驱动方法，应用于上述任一实施例所述的像素驱动电路，如图7所示，所述驱动方法包括:
通过第一扫描信号线输入的扫描信号控制电荷消除子电路使有机发光元件的阳极和阴极之间的电势反置；
通过第二扫描信号线输入的扫描信号控制开关子电路将本行数据信号线输出的数据电压写入存储电容并存储，且通过驱动子电路控制驱动有机发光元件发光。
在一个实施方式中，该驱动方法，还包括：
通过第一扫描信号线控制栅极电压复位子电路对驱动子电路的栅极电压进行复位。
本公开实施例提供的像素电路的驱动方法用于驱动上述实施例的像素驱动电路，可解决随着对有机发光元件长时间驱动发光导致其发光效率快速降低的问题，提高发光效率，同时提高有机发光元件的使用寿命。
需要说明的是，上述所述的连接指电性连接，相互连接的两端可以通过电信号。
本公开旨在涵盖本公开的任何变型、用途或者适应性变化，这些变型、用途或者适应性变化遵循本公开的一般性原理并包括本公开未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的，本公开的真正范围由权利要求确定。
应当理解的是，本公开并不局限于上面已经描述并在附图中示出的精确结构，并且可以在不脱离其范围进行各种修改和改变。本公开的范围仅由所附的权利要求来限制。

Claims (12)

  1. 一种像素驱动电路，包括：
    开关子电路，其控制端连接第一扫描信号线，其第一端连接数据信号线，其第二端连接驱动子电路的控制端，用于写入数据信号线输出的数据电压；
    驱动子电路，其第一端连接电源电压端，其第二端与有机发光元件的阳极连接，用于在所述开关子电路控制下驱动有机发光元件发光；
    存储电容，其一端与所述驱动子电路的控制端连接，其另一端连接所述驱动子电路的第一端，用于存储数据信号线输出的数据电压；
    电荷消除子电路，其控制端与第二扫描信号线连接，其他各端分别与所述驱动子电路的第一端、有机发光元件的阴极和参考电压端连接，用于在第二扫描信号线的控制下使有机发光元件的阳极和阴极之间的电势反置。
  2. 根据权利要求1所述的像素驱动电路，还包括：
    栅极电压复位子电路，其控制端连接第三扫描信号线，其他各端分别与有机发光元件的阴极、所述驱动子电路的控制端和参考电压端连接，用于在第三扫描信号线控制下对所述驱动子电路的栅极电压进行复位。
  3. 根据权利要求2所述的像素驱动电路，其中，所述第一扫描信号线为本行扫描信号线，所述第二扫描信号线和第三扫描信号线均为上一行扫描信号线。
  4. 根据权利要求1-3任一项所述的像素驱动电路，其中，所述开关子电路包括第一晶体管，所述第一晶体管的栅极作为其控制端，所述第一晶体管的第一极作为其第一端，所述第一晶体管的第二极作为其第二端。
  5. 根据权利要求1-4任一项所述的像素驱动电路，其中，所述驱动子电路包括第二晶体管，所述第二晶体管的栅极作为其控制端，所述第二晶体管的第一极作为其第一端，所述第二晶体管的第二极作为其第二端。
  6. 根据权利要求1-5任一项所述的像素驱动电路，其中，所述电荷消除子电路包括第三晶体管和第四晶体管，其中，
    所述第三晶体管的栅极和所述第四晶体管的栅极作为其控制端，连接第二扫描信号线；
    所述第三晶体管的第一极与所述驱动子电路的第一端连接，所述第三晶体管的第二极与有机发光元件的阴极连接；
    所述第四晶体管的第一极与所述有机发光元件的阴极连接，所述第四晶体管的第二极与参考电压端连接。
  7. 根据权利要求2所述的像素驱动电路，其中，所述栅极电压复位子电路包括第五晶体管和第六晶体管；
    所述第六晶体管的栅极作为其控制端，所述第六晶体管的第一极与有机发光元件的阴极连接，所述第六晶体管的第二极与第五晶体管的栅极连接；
    所述第五晶体管的第一极与所述驱动子电路的控制端连接，所述第五晶体管的第二极与参考电压端连接。
  8. 根据权利要求6所述的像素驱动电路，其中，所述第三晶体管和所述第四晶体管其中之一为N型晶体管，另一个为P型晶体管。
  9. 根据权利要求7所述的像素驱动电路，其中，所述第五晶体管和所述第六晶体管均为N型晶体管或者均为P型晶体管。
  10. 一种有机发光显示面板，包括多个像素单元、多条扫描信号线和多条数据信号线，所述扫描信号线和所述数据信号线交叉限定的区域构成各所述像素单元，每个像素单元包括有机发光元件和权利要求1-9任一项所述的像素驱动电路。
  11. 一种应用于权利要求1-9任一所述的像素驱动电路的方法，所述方法包括:
    通过第二扫描信号线输入的扫描信号控制电荷消除子电路使有机发光元件的阳极和阴极之间的电势反置；
    通过第一扫描信号线控制开关子电路将数据信号线输出的数据电压写入存储电容并存储，且通过驱动子电路控制驱动有机发光元件发光。
  12. 根据权利要求11所述的方法，还包括：
    通过第三扫描信号线控制栅极电压复位子电路对驱动子电路的栅极电压进行复位。
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