WO2014201755A1 - 像素电路及其驱动方法、有机发光显示面板及显示装置 - Google Patents

像素电路及其驱动方法、有机发光显示面板及显示装置 Download PDF

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Publication number
WO2014201755A1
WO2014201755A1 PCT/CN2013/080794 CN2013080794W WO2014201755A1 WO 2014201755 A1 WO2014201755 A1 WO 2014201755A1 CN 2013080794 W CN2013080794 W CN 2013080794W WO 2014201755 A1 WO2014201755 A1 WO 2014201755A1
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Prior art keywords
transistor
driving
capacitor
input terminal
state
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PCT/CN2013/080794
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English (en)
French (fr)
Inventor
青海刚
祁小敬
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—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
    • G09G3/3241—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 the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
    • G09G3/325—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 the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror the data current flowing through the driving transistor during a setting phase, e.g. by using a switch for connecting the driving transistor to the data driver
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G06F3/04184—Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • 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
    • G09G2300/0404—Matrix technologies
    • G09G2300/0417—Special arrangements specific to the use of low carrier mobility technology
    • 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
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0262—The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2354/00—Aspects of interface with display user

Definitions

  • Pixel circuit and driving method thereof organic light emitting display panel and display device
  • the present invention relates to the field of organic light emitting display, and in particular to a pixel circuit and a driving method thereof, an organic light emitting display panel, and a display device.
  • AMOLED Active Matrix Organic Light Emitting Diode
  • DTFT drive transistor
  • AMOLED display panels are primarily fabricated using TFT (Thin Film Transistor) process technology using LTPS (low temperature polysilicon).
  • TFT Thin Film Transistor
  • LTPS low temperature polysilicon
  • the driving current calculation formula generated by the DTFT usually includes the Vth of the TFT. Therefore, as described above, since the Vth of the TFTs in different positions of the display panel in the prior art is greatly different, the driving current of the AMOLED is different under the same gray-scale voltage, so that the brightness of the display panel may be different at different positions, resulting in display. The panel brightness is poor.
  • the touch function has become more and more widely used in various display panels, especially mobile displays, and has become a standard configuration of smart mobile devices.
  • the existing process is to separate the display panel and the touch panel, and then perform the bonding.
  • Such a process flow makes the function panel displaying the touch screen complicated in process, high in cost, and is not conducive to thinning and thinning of the display.
  • the invention provides a pixel circuit and a driving method thereof, an organic light emitting display panel and a display device, which can eliminate the influence of the internal resistance of the pixel circuit on the light-emitting driving current, and can improve the uniformity and reliability of the brightness of the organic light-emitting display panel.
  • An embodiment of the present invention provides a pixel circuit, including: a driving transistor, a first capacitor, an organic light emitting diode, a first control unit, and a driving unit; wherein - a drain of the driving transistor is connected to an anode of the organic light emitting diode ;
  • the cathode of the organic light emitting diode is connected to the second level signal input end;
  • the first control unit is respectively connected to the first scan signal input end, the data line, the fixed voltage input end, the first capacitor first end, the gate of the driving transistor, and the driving unit, and is used for Controlling, by a scan signal, controlling a potential of the first end of the first capacitor to a fixed voltage, inputting a data voltage to a gate of the driving transistor, and using a first capacitor to self-discharge the first capacitor through a driving transistor
  • the potential of the second end is maintained as the sum of the data voltage and the threshold voltage of the driving transistor;
  • the driving unit is respectively connected to the illumination control signal input end, the first level signal input end, the first capacitor second end, the gate and the source of the driving transistor, and the first control unit, for emitting light Under the control of the control signal, the voltage difference between the first capacitor is used as the gate-source voltage of the driving transistor to drive the organic light-emitting diode to emit light.
  • the first control unit includes:
  • a source of the sixth transistor is connected to the fixed voltage input end, a gate of the sixth transistor is connected to the first scan signal input end, and a drain of the sixth transistor is respectively connected to the first The first end of the capacitor and the driving unit are connected to the first node;
  • a source of the seventh transistor is connected to the data line, a gate of the seventh transistor is connected to the input end of the first scan signal, and a drain of the seventh transistor is respectively connected to a gate of the driving transistor
  • the drive unit is connected to the second node.
  • the driving unit comprises:
  • a source of the third transistor is connected to the input terminal of the first level signal, a gate of the third transistor is connected to the input end of the light emission control signal, and a drain of the third transistor is respectively associated with the The second end of the first capacitor and the source of the driving transistor are connected to the third node;
  • the source of the fifth transistor is connected to the second node, the gate of the fifth transistor is connected to the input end of the illumination control signal, and the drain of the fifth transistor is connected to the first node.
  • the pixel circuit further includes:
  • a fourth transistor for eliminating uncomposited carriers at the interface of the luminescent layer of the OLED
  • a drain of the fourth transistor is connected to the second level signal input end, a gate of the fourth transistor is connected to the first scan signal input end, a source of the fourth transistor is The anode of the organic light emitting diode is connected.
  • the pixel circuit further includes: a sensing electrode, an amplifying transistor, a second capacitor, a charging unit, and a second control unit; wherein:
  • the sensing electrodes are respectively connected to the charging unit, the first end of the second capacitor, and the gate of the amplifying transistor to the fourth node;
  • a source of the amplifying transistor is connected to the first level input terminal, and a drain of the amplifying transistor is connected to the second control unit;
  • the second end of the second capacitor is connected to the second scan signal input end
  • the charging unit is respectively connected to the first scan signal input end, the first level input end and the fourth node, and is configured to charge the second capacitor under the control of the first scan signal;
  • the second control unit is respectively connected to the second scan signal input end, the sensing line, and the drain of the amplifying transistor, and is configured to pass the signal current amplified by the amplifying transistor under the control of the second scan signal
  • the second control unit transmits to the sensing line to cause the chip to determine whether it is touched.
  • the charging unit comprises:
  • a source of the second transistor is connected to the first level signal input end, a gate of the second transistor is connected to the first scan signal input end, a drain of the second transistor is The fourth node is connected.
  • the second control unit comprises:
  • a source of the first transistor is connected to a drain of the amplifying transistor, a gate of the first transistor and a second scan signal input end, and a drain of the first transistor is connected to the sensing line
  • the transistor included in the pixel circuit is a P-type transistor;
  • the first level signal input end is connected to a high level;
  • the second level signal input terminal is connected to a low level.
  • the embodiment of the present invention further provides a pixel driving method for driving the pixel circuit provided by the embodiment of the present invention, which includes:
  • the first control unit controls the potential of the first end of the first capacitor to a fixed voltage, inputs the data voltage to the gate of the driving transistor, and uses the self-discharge of the driving capacitor by the first capacitor to make the first capacitor
  • the potential of the two terminals is maintained as the sum of the data voltage and the threshold voltage of the driving transistor, and the driving unit is in an off state;
  • the first control unit, the driving unit and the driving transistor are all in an off state; in the third stage, the first control unit is in an off state, and the driving unit uses the differential pressure across the first capacitor as the driving under the control of the illumination control signal
  • the gate-source voltage of the transistor drives the organic light-emitting diode to emit light.
  • the sixth transistor and the seventh transistor are in an on state, and the third transistor and the fifth transistor are in an off state;
  • the third transistor, the fifth transistor, the sixth transistor, and the seventh transistor are both in an off state
  • the third transistor and the fifth transistor are in an on state, and the sixth transistor and the seventh transistor are in an off state.
  • the fourth transistor is in an on state
  • the fourth transistor is in an off state
  • the fourth transistor is in an off state.
  • the first scan signal is at a low level, and the illumination control signal is at a high level; in the second phase, the first scan signal is at a high level, and the illumination control signal is at a high level; In the stage, the first scan signal is at a high level, and the illumination control signal is at a low level.
  • the method further includes:
  • the charging unit charges the second capacitor by using the first level signal, the amplifying transistor and the second control unit are in an off state; in the second phase and the third phase, the charging unit is in an off state, and the second control unit is to amplify the transistor
  • the amplified touch signal current is transmitted to the sensing line.
  • the second transistor is in an on state, and the first transistor is in an off state;
  • the second transistor In the second phase, the second transistor is in an off state and the first transistor is in an on state; in the third phase, the second transistor is in an off state and the first transistor is in an on state.
  • the first scan signal is at a low level, and the second scan signal is at a high level; in the second phase, the first scan signal is at a high level, and the second scan signal is at a low level; In the third stage, the first scan signal is at a high level, and the second scan signal is at a low level.
  • the embodiment of the present invention further provides an organic light emitting display panel, which may specifically include the pixel circuit provided by the embodiment of the present invention.
  • the embodiment of the present invention further provides a display device, which may specifically include the organic light emitting display panel provided by the embodiment of the present invention.
  • the pixel circuit and the driving method thereof, the organic light emitting display panel and the display device provided by the present invention are provided with a driving transistor, a first capacitor, an organic light emitting diode, a first control unit and a driving unit;
  • the first control unit is respectively connected to the first scan signal input end, the data line, the fixed voltage input end, the first capacitor first end, the gate of the driving transistor, and the driving unit, for the first scanning
  • the potential of the first end of the first capacitor is controlled to a fixed voltage
  • the potential of the second end of the first capacitor is maintained as the sum of the data voltage and the threshold voltage of the driving transistor by self-discharge by the driving transistor by using the first capacitor
  • the driving unit is respectively connected to the illumination control signal input end, the first level input end, the first capacitance second end, the gate and the source of the driving transistor, and the first control unit, for emitting light Under the control of the control signal, the voltage difference across the first capacitor is used as the gate-source voltage of the driving transistor to
  • the pixel circuit directly inputs the data voltage to the gate of the driving transistor, so that the gate potential of the driving transistor is fixed, and the threshold voltage of the driving transistor is saved in the storage capacitor by self-discharge of the storage capacitor, in one electrode of the storage capacitor.
  • the introduction of a fixed potential eliminates the influence of the internal resistance of the line on the illuminating current, thereby improving the unevenness of the panel picture display.
  • 3 is a schematic structural diagram 3 of a pixel circuit according to an embodiment of the present invention.
  • FIG. 4 is a schematic flowchart of a pixel circuit driving method according to an embodiment of the present invention.
  • FIG. 5 is a timing diagram of driving signals of a pixel circuit according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram 1 of an equivalent circuit of a pixel circuit according to an embodiment of the present invention.
  • FIG. 7 is a second schematic diagram of an equivalent circuit of a pixel circuit according to an embodiment of the present invention.
  • FIG. 8 is a third schematic diagram of an equivalent circuit of a pixel circuit according to an embodiment of the present invention.
  • FIG. 9 is a fourth schematic diagram of an equivalent circuit of a pixel circuit according to an embodiment of the present invention.
  • the embodiment of the present invention provides a pixel circuit, as shown in FIG. 1, which specifically includes: a driving transistor DTFT, a first capacitor C ST , an organic light emitting diode OLED, a first control unit 11 and a driving unit 12;
  • the drain of the driving transistor DTFT is connected to the anode of the organic light emitting diode OLED; the cathode of the organic light emitting diode OLED is connected to the second level signal input end;
  • the first control unit 11 is respectively connected to the first scan signal G (n), the number ⁇ ; 3 ⁇ 4 (Data Line, data voltage Vdaia input), the fixed voltage Vref input terminal, the first capacitor C ST , the driving crystal
  • the DTFT and the driving unit 12 are connected to control the potential of the first end of the first capacitor C ST to be a fixed voltage Vref and the data voltage Vdata to the gate of the driving transistor T6 under the control of the first scanning signal.
  • a capacitor C ST is self-discharged by the driving transistor DTFT such that the potential of the second terminal of the first capacitor C ST is maintained as the sum of the data voltage Vdata and the driving transistor threshold voltage Vthd;
  • the driving unit 12 is respectively connected to the light-emitting control signal EM (n) input terminal, the first level input terminal, the first capacitor C ST , the driving transistor DTFT, and the first control unit 11 for use under the control of the light-emitting control signal
  • the voltage difference across the first capacitor C ST acts as a gate-source voltage of the driving transistor DTFT, driving the organic light-emitting diode OLED to emit light.
  • the pixel circuit provided by the embodiment of the present invention directly inputs the data voltage Vdata to the gate of the driving transistor DTFT, so that the gate potential of the driving transistor DTFT is fixed, and the self-discharge of the storage capacitor C ST will drive the threshold voltage Vth of the transistor DTFT.
  • a fixed potential for example, a fixed voltage Vref
  • Vref a fixed voltage
  • the driving current is uniform, which can improve the uniformity and reliability of the brightness of the organic light emitting display panel.
  • the first control unit 11 may specifically include:
  • the source of the sixth transistor T6 is connected to the input terminal of the fixed voltage Vref, the gate of the sixth transistor T6 is connected to the input end of the first scan signal G(n), and the drain of the sixth transistor T6 is respectively connected to the first capacitor C ST One end, the driving unit 12 is connected to the first node (for example, node m);
  • the source of the seventh transistor T7 is connected to the data line, the gate of the seventh transistor T7 is connected to the input end of the first scan signal G (n), and the drain of the seventh transistor T7 is respectively connected to the gate of the driving transistor DTFT and the driving unit 12 Connected to a second node (eg, node g).
  • a second node eg, node g
  • the driving unit 12 may specifically include: a third transistor T3 and a fifth transistor T5;
  • the source of the third transistor T3 is connected to the first level signal input terminal, the gate of the third transistor T3 is connected to the input end of the light emission control signal EM (n), and the drain of the third transistor T3 is respectively connected to the first capacitor C ST
  • the second terminal, the source of the driving transistor DTFT is connected to the third node (for example, node n); the source of the fifth transistor T5 is connected to the node g, and the gate of the fifth transistor T5 is illuminated.
  • the control signal EM (n) is connected to the input terminal, and the drain of the fifth transistor T5 is connected to the node m.
  • the first level signal involved in the embodiment of the present invention may be a DC high level signal VDD, or another signal capable of timing input of a high level; and the second level signal may be a DC low level signal VSS. It can also be other signals that can output low level at a time.
  • the pixel circuit provided by the embodiment of the present invention may further include:
  • Inductive electrode SE: Sense Electrode
  • the sensing electrodes 13 are respectively connected to the charging unit 14, the first end of the second capacitor CP, and the gate of the amplifying transistor TATFT to the node p;
  • the source of the amplifying transistor ATFT is connected to the first level input terminal, and the drain second control unit 15 of the amplifying transistor ATFT is connected;
  • the second end of the second capacitor CP is connected to the input end of the second scan signal G (n+1 );
  • the charging unit 14 is respectively connected to the first scan signal G (n) input terminal, the first level input terminal and the fourth node (for example, the node p) for controlling under the control of the first scan signal G (n) Charging the second capacitor CP;
  • the second control unit 15 is respectively connected to the input end of the second scan signal G (n+1 ), the sense line (Sense Line), and the drain of the amplifying transistor ATFT for controlling under the second scan signal G (n+1 ) And transmitting the amplified touch signal current of the amplifying transistor ATFT to the sensing line, so that the chip determines whether it is touched.
  • the pixel circuit provided by the embodiment of the present invention can also integrate a touch detection circuit, which multiplexes the control signal in the AMOLED light-emitting drive circuit, charges the coupling capacitance in the touch detection circuit, and utilizes
  • the Amplify TFT (ATFT) amplifies the touch signal generated by the touch, and realizes the integration of the touch circuit on the panel without increasing the circuit structure and the operation complexity, thereby realizing the built-in type touch screen and
  • the integration of the organic light emitting diode driving display helps to reduce the thickness and weight of the display panel and reduce the cost of the display panel.
  • the charging unit 14 may specifically include: a second transistor T2; Specifically, the source of the second transistor T2 is connected to the first level signal input terminal, the gate of the second transistor ⁇ 2 is connected to the input end of the first scan signal G(n), and the drain of the second transistor ⁇ 2 is connected to the node. .
  • the second control unit 15 may specifically include:
  • the source of the first transistor T1 is connected to the drain of the amplifying transistor ATFT, the gate of the first transistor T1 and the input end of the second scan signal G (n+1 ), the drain of the first transistor T1 and the Inductive line connection.
  • the pixel circuit provided by the embodiment of the present invention may further include:
  • a fourth transistor ⁇ 4 for eliminating uncomposited carriers at the interface of the OLED light emitting layer of the organic light emitting diode.
  • the drain of the fourth transistor T4 is connected to the second level signal input terminal, and the gate of the fourth transistor T4 is connected to the input end of the first scan signal G(11), the fourth transistor.
  • the source of ⁇ 4 is connected to the anode of the organic light emitting diode OLED.
  • the fourth transistor T4 shorts the anode of the organic light emitting diode OLED to the second level input terminal, for example, VSS, while the first scan line is turned on, thereby eliminating the internal light emitting layer interface of the organic light emitting diode OLED.
  • the accumulated uncomposited carriers reduce the built-in electric field of the organic light emitting diode OLED due to charge accumulation, delaying the aging of the organic light emitting diode OLED.
  • the transistor according to the embodiment of the present invention includes a first transistor T1 to a seventh transistor T7, and a driving transistor DTFT and an amplifying transistor ATFT, and specifically may be a P-type transistor, and the above The source and drain in the transistor are interchangeable.
  • the embodiment of the present invention further provides a pixel circuit driving method for driving the pixel circuit provided by the embodiment of the present invention.
  • the pixel circuit driving method provided by the embodiment of the present invention may include:
  • Step 41 that is, in the first stage, the first control unit 11 controls the potential of the first end of the first capacitor C ST to a fixed voltage Vref, and inputs the data voltage Vdata to the gate of the driving transistor DTFT.
  • the first capacitor C ST is self-discharged by the driving transistor DTFT such that the potential of the second terminal of the first capacitor C ST is maintained as the sum of the data voltage Vdata and the threshold voltage Vthd of the driving transistor DTFT, the driving transistor DTFT is in an on state, and the driving unit 12 is turned off. status;
  • Step 42 that is, in the second stage, the first control unit 11, the driving unit 12, and the driving transistor DTFT are all in an off state;
  • Step 43 that is, in the third stage, the first control unit 11 is in an off state, and the driving unit 12 uses the voltage difference across the first capacitor C ST as the gate source voltage of the driving transistor DTFT under the control of the light emission control signal EM (n) Driving the organic light emitting diode OLED to emit light.
  • the pixel circuit driving method provided by the embodiment of the present invention directly inputs the data voltage Vdata to the gate of the driving transistor DTFT, so that the gate potential of the driving transistor DTFT is fixed, and the self-discharging by the driving transistor DTFT by using the first capacitor C ST
  • the threshold voltage Vthd of the driving transistor DTFT is stored in the first capacitor C ST , and a fixed potential (for example, a fixed voltage Vref ) is introduced into one electrode of the storage capacitor C ST to eliminate the influence of the internal resistance of the line on the illuminating current, thereby causing the organic light emitting display panel
  • the OLED drive currents at different positions in the middle are uniform, which can improve the uniformity and reliability of the brightness of the organic light-emitting display panel.
  • the pixel circuit driving method provided by the embodiment of the present invention may further include the following steps:
  • the charging unit 14 charges the second capacitor Cp by using the first level signal, and the amplifying transistor ATFT and the second control unit 15 are in an off state;
  • the charging unit 14 and the amplifying transistor ATFT are in an off state, and the second control unit 15 amplifies the amplifying transistor ATFT to transmit the touch signal current to the sensing line.
  • the charging unit 14 is in an off state, and the second control unit 15 and the amplifying transistor ATFT are in an on state.
  • the pixel circuit driving method provided by the embodiment of the present invention can also multiplex the control signal in the AMOLED light-emitting driving circuit, charge the coupling capacitor in the touch detection circuit, and utilize an Amplify TFT (ATFT).
  • the touch signal generated by the touch is amplified to realize the detection of the touch signal while driving the organic light emitting diode OELD to emit light.
  • the pixel circuit driving method provided by the embodiment of the present invention may further include the following steps: In the first stage, the fourth transistor T4 is in an on state;
  • the fourth transistor T4 is in an off state
  • the fourth transistor T4 is in an off state.
  • the anode of the organic light emitting diode OLED is shorted to the second level input end, for example, VSS, while the first scan line is turned on, thereby eliminating the internal light emitting layer interface of the organic light emitting diode OLED.
  • the accumulated uncomposited carriers reduce the built-in electric field of the organic light emitting diode OLED due to charge accumulation, delaying the aging of the organic light emitting diode OLED.
  • the first level signal is VDD and the second level signal is VSS.
  • the first scan signal G(n) is at a low level
  • the second scan signal G(n+1) is at a high level
  • the light emission control signal EM(n) is at a high level
  • the second transistor T2 is The sixth transistor ⁇ 6 and the seventh transistor ⁇ 7 are turned on, and the first transistor T1, the third transistor ⁇ 3, and the fifth transistor ⁇ 5 are turned off, and the drain of the amplifying transistor ATFT is in an off state, the first level.
  • the signal VDD charges the coupling capacitor, that is, the second capacitor Cp, through the second transistor ⁇ 2.
  • the potential of the other node of the second capacitor Cp that is, the potential of the node q is the potential of the second scan signal G( n +1).
  • Flat VGH At this time, a partial equivalent circuit diagram of the pixel circuit can be as shown in FIG. 6, wherein the direction indicated by the arrow is the current direction.
  • the potential of the n-node is the first level signal VDD when the first capacitor Cst is normally illuminated.
  • the gate potential of the driving transistor DTFT is fixed to the data line Vdata input by the data line. , still in a certain on state, so the n-node of the first capacitor Cst is discharged through the driving transistor DTFT until the potential of the n-node drops to the sum of the data voltage Vdata and the threshold voltage
  • -Vref ; and the second capacitor Cp The voltage at both ends is: Vcp Vp- Vq VDD- VGH.
  • a partial equivalent circuit diagram of the pixel circuit at this time can be as shown in FIG.
  • the anode of the organic light emitting diode OLED is connected to the second level signal VSS, so that the hole transport layer/light emitting layer (or the light emitting layer/electron transport layer:) exists in the light emitting phase.
  • the uncomplexed excess holes (or electrons) accumulated at the interface are consumed, and the built-in electric field of the organic light emitting diode OLED due to charge accumulation is reduced, which delays the aging of the OLED.
  • the second stage the first scan signal G (r jumps to the high level, the second scan signal G +l), the voltage jumps to the low level, and the illumination control signal EM(n) remains high, therefore,
  • One transistor T1 and the amplifying transistor ATFT are in an on state, and the second transistor T2 to the seventh transistor T7 are all in an off state, driving the transistor DTFT.
  • the second transistor T2 is turned off, the second capacitor Cp has a capacitance p point floating, so when the potential of the second scan signal G(n+1) jumps to a low level, the coupling of the second capacitor Cp, the node p is an amplifying transistor ATFT
  • the gate potential will also jump down.
  • the number of jumps there are two cases. If there is a finger touch, since the coupling capacitance Cf is formed between the finger and the sensing electrode S E , the potential of the p point is:
  • Vp VDD+(VGL- VGH)* Cp/(Cp+Cf) ;
  • Ise a(Vsg-jVtha
  • ) 2 a(Vsg-jVtha
  • ) 2 a[(VGH-VGL)*Cp/(Cp+Cf)
  • Vtha is the threshold voltage of the amplifying transistor ATFT
  • Ka is the constant of the amplifying transistor ATFT related to the process and design.
  • Vp VDD-(VGH-VGL);
  • the gate-source voltage Vsg is:
  • Vsg-Vs-Vg-VDD-[ VDD- (VGH- VGL)] VGH-VGL;
  • the magnitude of the induced current through the sense line Sense line is:
  • a partial equivalent circuit diagram of the pixel circuit at this time can be as shown in FIG.
  • the first control unit 11, the driving unit 12, and the driving transistor DTFT are all in a cut-off state.
  • the third stage the first scan signal G (n is a high level, the second scan signal G i+1) and the light emission control signal EM0Q) are at a low level, therefore, the second transistor T2, the fourth transistor ⁇ 4, the sixth The transistor ⁇ 6 and the seventh transistor ⁇ 7 are in an off state, and the first transistor T1, the third transistor ⁇ 3, and the fifth transistor ⁇ 5 are in an on state.
  • the gate-source voltage VDD (because the third transistor T3 is turned on), the voltage across the first capacitor Cst still does not change, and for the driving transistor DTFT, the gate-source voltage:
  • is the threshold voltage of the driving transistor DTFT.
  • the saturation current through the driving transistor DTFT that is, the illuminating current of the organic light emitting diode OLED is:
  • the magnitude of the driving current is only related to the data voltage Vdata and the fixed voltage Vref, and has no relationship with the threshold voltage
  • a partial equivalent circuit diagram of the pixel circuit at this time can be as shown in FIG.
  • the pixel circuit according to the embodiment of the present invention further provides an organic light-emitting display panel, and the organic light-emitting display panel may specifically include the pixel circuit provided by the embodiment of the present invention.
  • the embodiment of the present invention further provides a display device, which may specifically include the organic light emitting display panel provided by the embodiment of the present invention.
  • the display device may specifically be a display device such as a liquid crystal panel, a liquid crystal television, a liquid crystal display, an OLED panel, an OLED display, a plasma display, or an electronic paper.
  • the pixel circuit, the organic light emitting display panel and the display device of the present invention are particularly suitable for the GOA circuit requirements under the LTPS (low temperature polysilicon technology) process, and are also applicable to the GO A circuit under the amorphous silicon process.
  • the pixel circuit and the driving method thereof, the organic light emitting display panel and the display device provided by the present invention directly input the data voltage Vdata to the gate of the driving transistor DTFT, so that the gate potential of the driving transistor DTFT is fixed while using the first capacitor C ST
  • the self-discharge saves the threshold voltage Vthd of the driving transistor DTFT in the first capacitor C ST , and a fixed potential (for example, a fixed voltage Vref ) is introduced into one electrode of the first capacitor C ST to eliminate the influence of the internal resistance of the line on the illuminating current, thereby
  • the OLED driving currents at different positions in the organic light emitting display panel are made uniform, and the uniformity and reliability of the brightness of the organic light emitting display panel can be improved.
  • the pixel circuit provided by the present invention further includes a touch signal detecting circuit, which multiplexes the control signal in the AMOLED light emitting driving circuit, charges the coupling capacitor in the touch detecting circuit, and utilizes the amplification
  • the Amplify TFT amplifies the touch signal generated by the touch screen, and realizes the integration of the touch circuit on the panel without increasing the circuit structure and operation complexity, thereby realizing the built-in type touch screen and
  • the integration of the organic light emitting diode driving display helps to reduce the thickness and weight of the display panel and reduce the cost of the display panel.
  • the pixel circuit provided by the present invention may further be provided with a fourth transistor T4 for eliminating uncomposited carriers at the interface of the OLED of the OLED, and shorting the anode of the OLED while the first scan line is turned on.
  • a fourth transistor T4 for eliminating uncomposited carriers at the interface of the OLED of the OLED, and shorting the anode of the OLED while the first scan line is turned on.
  • the second level input terminal for example, VSS, thereby eliminating uncomplexed carriers accumulated in the interface of the light emitting layer of the organic light emitting diode OLED, reducing the built-in electric field of the organic light emitting diode OLED due to charge accumulation, and delaying the organic light emitting diode Aging of OLEDs.
  • the pixel circuit provided by the embodiment of the present invention can be applied to a thin film transistor of a process of amorphous silicon, polysilicon, oxide, or the like.
  • the above embodiment is described by taking a single P-type thin film transistor as an example, the above circuit can be easily changed to a single N-type thin film transistor or CMOS transistor circuit; The function part is removed, and the driving touch circuit is changed to a pure pixel light-emitting driving circuit.
  • the above embodiment has been described by taking an active matrix organic light emitting diode as an example, the present invention is not limited to the use of an active matrix organic
  • the display device of the light emitting diode can also be applied to a display device using other various light emitting diodes.
  • the above description is only an embodiment of the present invention, and it should be noted that those skilled in the art can also make thousands of improvements and retouchings without departing from the principles of the present invention. It is considered as the scope of protection of the present invention.

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Abstract

一种像素电路及其驱动方法、有机发光显示面板及显示装置，其中，该像素电路中设置有驱动晶体管（DTFT）、第一电容（CST）、有机发光二极管（OLED）、第一控制单元（11）以及驱动单元（12），该像素电路通过将数据电压（Vdata）直接输入到驱动晶体管（DTFT）的栅极，使得驱动晶体管（DTFT）的栅极电位固定，同时利用存储电容（CST）的自放电将驱动晶体管（DTFT）的阈值电压（Vthd）保存在存储电容（CST）中，存储电容（CST）的一个电极中引入固定电位（Vref）消除线路内阻对发光电流的影响，从而改善了面板画面显示的不均匀性。

Description

像素电路及其驱动方法、 有机发光显示面板及显示装置 技术领域
本发明涉及有机发光显示领域， 尤其涉及一种像素电路及其驱动方法、 有机发光显示面板及显示装置。 累仪不
AMOLED (有源矩阵有机发光二极管： Active Matrix Organic Light Emitting Diode ) 之所以能够发光， 通常是由 DTFT (驱动晶体管） 在饱和状 态时产生的驱动电流驱动。
目前， AMOLED显示面板主要制作方式是利用 LTPS (低温多晶硅） 的 TFT (薄膜晶体管）工艺技术来制作。 但是， 由于 LTPS工艺的不成熟， 即便 是同样的工艺参数， 制作出来的显示面板不同位置的 TFT的 Vth (晶体管阈 值电压） 也有较大差异， 同时 Vth也有漂移。
而现有传统的 AMOLED驱动电路中， DTFT所产生的驱动电流计算公式 中， 通常包含 TFT的 Vth。 那么如上所述， 由于现有技术中显示面板不同位 置的 TFT的 Vth存在较大差异， 导致了同一灰阶电压下 AMOLED的驱动电 流不一样， 因此导致显示面板不同位置亮度会有差异， 致使显示面板亮度均 一性差。
另外， 触摸功能在各种显示面板尤其是移动显示中的应用越来越广， 几 乎成了智能移动设备的标准配置， 现有的工艺是将显示面板和触摸面板分开 制作， 然后再进行贴合， 这样的工艺流程使得显示触摸屏的功能面板工艺复 杂， 成本高， 也不利于显示的轻薄化。 tftdr t-f-t if^
发明内谷
本发明提供一种像素电路及其驱动方法、有机发光显示面板及显示装置， 可以消除像素电路内阻对发光驱动电流的影响， 可改善有机发光显示面板亮 度的均勾性和可靠性。
本发明提供方案如下： 本发明实施例提供了一种像素电路， 包括： 驱动晶体管、 第一电容、 有 机发光二极管、 第一控制单元以及驱动单元； 其中- 所述驱动晶体管的漏极与所述有机发光二极管的阳极连接；
所述有机发光二极管的阴极与第二电平信号输入端连接；
所述第一控制单元分别与第一扫描信号输入端、 数据线、 固定电压输入 端、 所述第一电容第一端、 所述驱动晶体管的栅极、 所述驱动单元连接， 用 于在第一扫描信号控制下，将所述第一电容的第一端的电位控制为固定电压， 将数据电压输入至所述驱动晶体管的栅极， 利用第一电容通过驱动晶体管的 自放电将第一电容的第二端的电位保持为数据电压和驱动晶体管阈值电压之 和；
驱动单元分别与发光控制信号输入端、 第一电平信号输入端、 所述第一 电容第二端、 所述驱动晶体管的栅极和源极、 所述第一控制单元连接， 用于 在发光控制信号控制下， 利用所述第一电容两端的压差作为驱动晶体管的栅 源电压， 驱动有机发光二极管发光。
优选的， 所述第一控制单元包括：
第六晶体管和第七晶体管； 其中：
所述第六晶体管的源极与所述固定电压输入端连接， 所述第六晶体管的 栅极与所述第一扫描信号输入端连接， 所述第六晶体管的漏极分别与所述第 一电容的第一端、 驱动单元连接于第一节点；
第七晶体管的源极与所述数据线连接， 所述第七晶体管的栅极与所述第 一扫描信号输入端连接，所述第七晶体管的漏极分别与所述驱动晶体管栅极、 所述驱动单元连接于第二节点。
优选的， 所述驱动单元包括：
第三晶体管和第五晶体管； 其中：
所述第三晶体管的源极与所述第一电平信号输入端连接， 所述第三晶体 管的栅极与所述发光控制信号输入端连接， 所述第三晶体管的漏极分别与所 述第一电容的第二端、 驱动晶体管的源极连接于第三节点；
所述第五晶体管的源极与所述第二节点连接， 所述第五晶体管的栅极与 所述发光控制信号输入端连接，所述第五晶体管的漏极与所述第一节点连接。 优选的， 所述像素电路还包括：
用于消除所述有机发光二极管发光层界面处未复合载流子的第四晶体 管；
所述第四晶体管的漏极与所述第二电平信号输入端连接， 所述第四晶体 管的栅极与所述第一扫描信号输入端连接， 所述第四晶体管的源极与所述有 机发光二极管的阳极连接。
优选的， 所述像素电路还包括： 感应电极、 放大晶体管、 第二电容、 充 电单元以及第二控制单元； 其中：
所述感应电极分别与所述充电单元、 第二电容的第一端、 放大晶体管的 栅极连接于第四节点；
所述放大晶体管的源极与所述第一电平输入端连接， 所述放大晶体管的 漏极与所述第二控制单元连接；
所述第二电容的第二端与第二扫描信号输入端连接；
所述充电单元分别与第一扫描信号输入端、 第一电平输入端以及所述第 四节点连接， 用于在第一扫描信号控制下， 为所述第二电容充电；
所述第二控制单元分别与所述第二扫描信号输入端、 感应线、 所述放大 晶体管的漏极连接， 用于在所述第二扫描信号控制下， 并将放大晶体管放大 的信号电流通过第二控制单元传输到感应线， 以使芯片确定是否被触摸。
优选的， 所述充电单元包括：
第二晶体管；
所述第二晶体管的源极与所述第一电平信号输入端连接， 所述第二晶体 管的栅极与所述第一扫描信号输入端连接， 所述第二晶体管的漏极与所述第 四节点连接。
优选的， 所述第二控制单元包括：
第一晶体管；
所述第一晶体管的源极与所述放大晶体管的漏极连接， 所述第一晶体管 的栅极与所述第二扫描信号输入端， 所述第一晶体管的漏极与所述感应线连 优选的， 所述像素电路中包括的晶体管为 P型晶体管; 所述第一电平信号输入端连接有高电平；
所述第二电平信号输入端连接有低电平。
本发明实施例还提供了一种驱动上述本发明实施例提供的所述像素电路 的像素驱动方法， 包括：
第一阶段， 第一控制单元将第一电容的第一端的电位控制为固定电压， 将数据电压输入至驱动晶体管的栅极， 利用第一电容通过驱动晶体管的自放 电使得第一电容的第二端的电位保持为数据电压和驱动晶体管阈值电压之 和， 驱动单元处于截止状态；
第二阶段， 第一控制单元、 驱动单元以及驱动晶体管均处于截止状态； 第三阶段， 第一控制单元处于截止状态， 驱动单元在发光控制信号控制 下， 利用第一电容两端的压差作为驱动晶体管的栅源电压， 驱动有机发光二 极管发光。
优选的， 在第一阶段， 第六晶体管、 第七晶体管处于导通状态， 第三晶 体管、 第五晶体管处于截止状态；
在第二阶段， 第三晶体管、 第五晶体管、 第六晶体管、 第七晶体管均处 于截止状态；
在第三阶段， 第三晶体管、 第五晶体管处于导通状态， 第六晶体管、 第 七晶体管处于截止状态。
优选的， 在第一阶段， 第四晶体管处于导通状态；
在第二阶段， 第四晶体管处于截止状态；
在第三阶段， 第四晶体管处于截止状态。
优选的， 在第一阶段， 第一扫描信号为低电平， 发光控制信号为高电平; 在第二阶段， 第一扫描信号为高电平， 发光控制信号为高电平； 在第三阶段， 第一扫描信号为高电平， 发光控制信号为低电平。
优选的， 所述方法还包括：
第一阶段， 充电单元利用第一电平信号为第二电容充电， 放大晶体管和 第二控制单元处于截止状态； 第二阶段和第三阶段， 充电单元处于截止状态， 第二控制单元将放大晶 体管放大的触摸信号电流传输至感应线。 优选的， 在第一阶段， 第二晶体管处于导通状态， 第一晶体管处于截止 状态；
在第二阶段， 第二晶体管处于截止状态、 第一晶体管处于导通状态； 在第三阶段， 第二晶体管处于截止状态、 第一晶体管处于导通状态。 优选的， 在第一阶段， 第一扫描信号为低电平， 第二扫描信号为高电平; 在第二阶段， 第一扫描信号为高电平， 第二扫描信号为低电平； 在第三阶段， 第一扫描信号为高电平， 第二扫描信号为低电平。
本发明实施例还提供了一种有机发光显示面板， 其具体可以包括上述本 发明实施例提供的所述像素电路。
本发明实施例还提供了一种显示装置， 其具体可以包括上述本发明实施 例提供的所述有机发光显示面板。
从以上所述可以看出， 本发明提供的像素电路及其驱动方法、 有机发光 显示面板及显示装置， 通过设置驱动晶体管、 第一电容、 有机发光二极管、 第一控制单元以及驱动单元；所述第一控制单元分别与第一扫描信号输入端、 数据线、 固定电压输入端、 所述第一电容第一端、 所述驱动晶体管的栅极、 所述驱动单元连接， 用于在第一扫描信号控制下， 将所述第一电容第一端的 电位控制为固定电压， 利用第一电容通过驱动晶体管自放电将所述第一电容 第二端的电位保持为数据电压和驱动晶体管阈值电压之和； 驱动单元分别与 发光控制信号输入端、 第一电平输入端、 所述第一电容第二端、 所述驱动晶 体管的栅极和源极、 所述第一控制单元连接， 用于在发光控制信号控制下， 利用所述第一电容两端的压差作为驱动晶体管的栅源电压， 驱动有机发光二 极管发光。 该像素电路通过将数据电压直接输入到驱动晶体管的栅极， 使得 驱动晶体管的栅极电位固定， 同时利用存储电容的自放电将驱动晶体管的阈 值电压保存在存储电容中， 存储电容的一个电极中引入固定电位消除线路内 阻对发光电流的影响， 从而改善了面板画面显示的不均匀性。 图 3为本发明实施例提供的像素电路结构示意图三；
图 4为本发明实施例提供的像素电路驱动方法流程示意图；
图 5为本发明实施例提供的像素电路驱动信号时序图；
图 6为本发明实施例提供的像素电路部分等效电路示意图一;
图 7为本发明实施例提供的像素电路部分等效电路示意图二;
图 8为本发明实施例提供的像素电路部分等效电路示意图三;
图 9为本发明实施例提供的像素电路部分等效电路示意图四。 具评头 J®万
为使本发明实施例的目的、 技术方案和优点更加清楚， 下面将结合本发 明实施例的附图， 对本发明实施例的技术方案进行清楚、 完整地描述。 显然， 所描述的实施例是本发明的一部分实施例， 而不是全部的实施例。 基于所描 述的本发明的实施例， 本领域普通技术人员所获得的所有其他实施例， 都属 于本发明保护的范围。
除非另作定义， 此处使用的技术术语或者科学术语应当为本发明所属领 域内具有一般技能的人士所理解的通常意义。 本发明专利申请说明书以及权 利要求书中使用的 "第一 "、 "第二" 以及类似的词语并不表示任何顺序、 数 量或者重要性， 而只是用来区分不同的组成部分。 同样， "一个"或者 "一" 等类似词语也不表示数量限制， 而是表示存在至少一个。 "连接"或者"相连" 等类似的词语并非限定于物理的或者机械的连接，而是可以包括电性的连接， 不管是直接的还是间接的。 "上"、 "下"、 "左"、 "右"等仅用于表示相对位置 关系， 当被描述对象的绝对位置改变后， 则该相对位置关系也相应地改变。
本发明实施例提供了一种像素电路， 如附图 1所示， 其具体以包括： 驱 动晶体管 DTFT、 第一电容 CST、 有机发光二极管 OLED、 第一控制单元 11 以及驱动单元 12; 其中：
驱动晶体管 DTFT的漏极与有机发光二极管 OLED的阳极连接； 有机发光二极管 OLED的阴极与第二电平信号输入端连接；
第一控制单元 11，分别与第一扫描信号 G (n)输 端、数搌; ¾ ( Data Line, 即数据电压 Vdaia输入端）、 固定电压 Vref输入端、 第一电容 CST、 驱动晶体 管 DTFT、 驱动单元 12连接， 用于在第一扫描信号控制下， 将第一电容 CST 第一端的电位控制为固定电压 Vref， 将数据电压 Vdata输入至驱动晶体管 T6 的栅极，利用第一电容 CST通过驱动晶体管 DTFT的自放电使得第一电容 CST 第二端的电位保持为数据电压 Vdata和驱动晶体管阈值电压 Vthd之和；
驱动单元 12， 分别与发光控制信号 EM (n) 输入端、 第一电平输入端、 第一电容 CST、 驱动晶体管 DTFT、 第一控制单元 11连接， 用于在发光控制 信号控制下， 利用第一电容 CST两端的压差作为驱动晶体管 DTFT栅源电压， 驱动有机发光二极管 OLED发光。
本发明实施例提供的像素电路， 通过直接将数据电压 Vdata输入到驱动 晶体管 DTFT的栅极， 使得驱动晶体管 DTFT栅极电位固定， 同时利用存储 电容 CST的自放电将驱动晶体管 DTFT的阈值电压 Vthd保存在第一电容 CST 中， 第一电容 CST的一个电极中引入固定电位 （例如固定电压 Vref) 以消除 线路内阻对发光电流的影响， 从而使有机发光显示面板中不同位置处的 OLED驱动电流一致， 可改善有机发光显示面板亮度的均匀性和可靠性。
在本发明一具体实施例中， 如附图 2所示， 第一控制单元 11具体可以包 括：
第六晶体管 T6和第七晶体管 T7; 其中：
第六晶体管 T6的源极与固定电压 Vref输入端连接，第六晶体管 T6的栅 极与第一扫描信号 G (n) 输入端连接， 第六晶体管 T6的漏极分别与第一电 容 CST第一端、 驱动单元 12连接于第一节点 （例如， 节点 m);
第七晶体管 T7的源极与数据线连接， 第七晶体管 T7的栅极与第一扫描 信号 G (n) 输入端连接， 第七晶体管 T7的漏极分别与驱动晶体管 DTFT栅 极、 驱动单元 12连接于第二节点 (例如， 节点 g)。
在本发明一具体实施例中， 如附图 2所示， 驱动单元 12具体可以包括： 第三晶体管 T3和第五晶体管 T5; 其中：
第三晶体管 T3的源极与第一电平信号输入端连接， 第三晶体管 T3的栅 极与发光控制信号 EM (n) 输入端连接， 第三晶体管 T3 的漏极分别与第一 电容 CST第二端、 驱动晶体管 DTFT的源极连接于第三节点（例如， 节点 n); 第五晶体管 T5的源极与所述节点 g连接， 第五晶体管 T5的栅极与发光 控制信号 EM (n) 输入端连接， 第五晶体管 T5的漏极与所述节点 m连接。 本发明实施例所涉及的第一电平信号具体可以为直流高电平信号 VDD, 也可以是其他能定时输入高电平的信号； 而第二电平信号可以为直流低电平 信号 VSS， 也可以是其他能定时输出低电平的信号。
在本发明一具体实施例中， 如附图 3所示， 本发明实施例提供的像素电 路具体还可以包括：
感应电极 ( SE: Sense Electrode ) 13、放大晶体管 ATFT、第二电容 CP、 充电单元 14以及第二控制单元 15; 其中：
感应电极 13分别与充电单元 14、第二电容 CP第一端、放大晶体管 TATFT 的栅极连接于节点 p;
放大晶体管 ATFT的源极与第一电平输入端连接， 放大晶体管 ATFT的 漏极第二控制单元 15连接；
第二电容 CP的第二端与第二扫描信号 G (n+1 ) 输入端连接；
充电单元 14分别与第一扫描信号 G (n) 输入端、 第一电平输入端以及 第四节点 （例如， 节点 p) 连接， 用于在第一扫描信号 G (n) 控制下， 为述 第二电容 CP充电；
第二控制单元 15分别与第二扫描信号 G (n+1 )输入端、 感应线 （Sense Line), 放大晶体管 ATFT的漏极连接， 用于在第二扫描信号 G (n+1 ) 控制 下， 将放大晶体管 ATFT放大的触摸信号电流传输至感应线， 以使芯片确定 是否被触碰。
可见， 本发明实施例提供的像素电路， 还可以集成触摸侦测电路， 该触 摸侦测电路复用了 AMOLED发光驱动电路中的控制信号， 对触摸侦测电路 中的耦合电容进行充电， 并利用放大管晶体管 （Amplify TFT， 即 ATFT) 对 触摸产生的触摸信号进行放大， 在不增加电路结构和操作复杂性的同时， 很 好的实现了触摸电路在面板上集成， 从而可实现内置型触摸屏和有机发光二 极管驱动显示的一体化， 有利于降低显示面板的厚度和重量， 并可降低显示 面板的成本。
在本发明一具体实施例中， 如附图 2所示， 充电单元 14具体可以包括： 第二晶体管 T2; 具体的，第二晶体管 T2的源极与第一电平信号输入端连接，第二晶体管 Τ2的栅极与第一扫描信号 G (η)输入端连接， 第二晶体管 Τ2的漏极与节点 连接。
在本发明一具体实施例中， 如附图 2所示， 第二控制单元 15具体可以包 括：
第一晶体管 T1 ;
具体的， 第一晶体管 T1的源极与放大晶体管 ATFT的漏极连接， 第一晶 体管 T1 的栅极与第二扫描信号 G (η+1 ) 输入端， 第一晶体管 T1 的漏极与 所述感应线连接。
在本发明一具体实施例中， 本发明实施例提供的像素电路具体还可以包 括：
用于消除有机发光二极管 OLED发光层界面处未复合载流子的第四晶体 管 Τ4。
具体的，如附图 2所示， 第四晶体管 Τ4的漏极与第二电平信号输入端连 接， 第四晶体管 Τ4的栅极与第一扫描信号 G ( 11 ) 输入端连接， 第四晶体管 Τ4的源极与有机发光二极管 OLED的阳极连接。
本发明实施例所涉及的第四晶体管 T4， 在第一扫描线开启的同时使有机 发光二极管 OLED的阳极短接到第二电平输入端例如 VSS， 从而可消除有机 发光二极管 OLED内部发光层界面累积的未复合的载流子， 减小有机发光二 极管 OLED由于电荷累积的形成的内建电场， 延缓有机发光二极管 OLED的 老化。
在本发明一可选实施例中， 上述本发明实施例所涉及的晶体管， 包括第 一晶体管 T1至第七晶体管 T7， 以及驱动晶体管 DTFT、 放大晶体管 ATFT， 具体均可为 P型晶体管， 且上述晶体管中的源、 漏极可互换。
本发明实施例还提供了一种驱动上述本发明实施例提供的像素电路的像 素电路驱动方法。 如附图 4所示， 本发明实施例提供的像素电路驱动方法具 体可以包括：
歩骤 41， 即第一阶段， 第一控制单元 11将第一电容 CST第一端的电位控 制为固定电压 Vref， 将数据电压 Vdata输入至驱动晶体管 DTFT的栅极， 利 用第一电容 CST通过驱动晶体管 DTFT自放电使得第一电容 CST第二端的电位 保持为数据电压 Vdata和驱动晶体管 DTFT阈值电压 Vthd之和， 驱动晶体管 DTFT处于导通状态， 驱动单元 12处于截止状态；
歩骤 42， 即第二阶段， 第一控制单元 11、 驱动单元 12以及驱动晶体管 DTFT均处于截止状态；
歩骤 43， 即第三阶段， 第一控制单元 11处于截止状态， 驱动单元 12在 发光控制信号 EM (n) 控制下， 利用第一电容 CST两端的压差作为驱动晶体 管 DTFT的栅源电压， 驱动有机发光二极管 OLED发光。
本发明实施例提供的像素电路驱动方法， 通过直接将数据电压 Vdata输 入到驱动晶体管 DTFT的栅极， 使得驱动晶体管 DTFT栅极电位固定， 同时 利用第一电容 CST的通过驱动晶体管 DTFT 自放电将驱动晶体管 DTFT的阈 值电压 Vthd保存在第一电容 CST中， 存储电容 CST的一个电极中引入固定电 位 （例如固定电压 Vref) 以消除线路内阻对发光电流的影响， 从而使有机发 光显示面板中不同位置处的 OLED驱动电流一致， 可改善有机发光显示面板 亮度的均匀性和可靠性。
在本发明一具体实施例中， 本发明实施例提供的像素电路驱动方法具体 还可以包括以下步骤：
第一阶段， 充电单元 14利用第一电平信号为第二电容 Cp充电， 放大晶 体管 ATFT和第二控制单元 15处于截止状态；
第二阶段， 充电单元 14和放大晶体管 ATFT处于截止状态， 第二控制单 元 15将放大晶体管 ATFT放大的将触摸信号电流传输至感应线。
第三阶段， 充电单元 14处于截止状态， 第二控制单元 15和放大晶体管 ATFT处于导通状态。
可见， 本发明实施例提供的像素电路驱动方法， 还可以复用 AMOLED 发光驱动电路中的控制信号， 对触摸侦测电路中的耦合电容进行充电， 并利 用放大管晶体管（Amplify TFT， 即 ATFT)对触摸产生的触摸信号进行放大， 从而在驱动有机发光二极管 OELD发光的同时， 实现对触摸信号的侦测。
在本发明一具体实施例中， 本发明实施例提供的像素电路驱动方法具体 还可以包括以下歩骤： 在第一阶段， 第四晶体管 T4处于导通状态；
在第二阶段， 第四晶体管 T4处于截止状态；
在第三阶段， 第四晶体管 T4处于截止状态。
本发明实施例所提供的像素电路驱动方法， 在第一扫描线开启的同时使 有机发光二极管 OLED的阳极短接到第二电平输入端例如 VSS， 从而可消除 有机发光二极管 OLED内部发光层界面累积的未复合的载流子， 减小有机发 光二极管 OLED由于电荷累积的形成的内建电场，延缓有机发光二极管 OLED 的老化。
下面， 结合附图 5所示的时序图， 对本发明实施例提供的像素电路驱动 方法的具体实现过程进行描述。
该实施例中， 第一电平信号为 VDD， 第二电平信号为 VSS。
该实施例的具体实现过程可以包括：
在第一阶段： 第一扫描信号 G(n)为低电平， 第二扫描信号 G(n+1)为高电 平， 发光控制信号 EM(n)为高电平， 第二晶体管 T2、第六晶体管 Τ6、 第七晶 体管 Τ7开启即处于导通状态， 第一晶体管 Tl、 第三晶体管 Τ3、 第五晶体管 Τ5关闭即处于截止状态， 放大晶体管 ATFT的漏极处于断路状态， 第一电平 信号 VDD通过第二晶体管 Τ2对耦合电容即第二电容 Cp充电， 此时第二电 容 Cp电容的另一极即节点 q的电位为第二扫描信号 G(n+1)的电位即为高电 平 VGH。 此时像素电路的部分等效电路图可如附图 6所示， 其中箭头所示方 向为电流方向。
而由于第一电容 Cst在正常发光时 n节点的电位为第一电平信号 VDD, 当第三晶体管 T3关闭后， 驱动晶体管 DTFT的栅极电位固定为数据线（Data line) 输入的数据电压 Vdata, 依然处于一定的开启状态， 因此第一电容 Cst 的 n节点会通过驱动晶体管 DTFT放电， 直到 n节点的电位下降到数据电压 Vdata与驱动晶体管 TDTFT的阈值电压 |Vthd|之和， 由于第六晶体管 T6导通 状态， 第一电容 Cst 的 m节点的电位一直固定为固定电位 Vref， 因此第一电 容 Cst最后两端的电压为： Vcst=Vn- Vm= Vdata+jVthd|-Vref; 而第二电容 Cp 两端的电压为： Vcp=Vp- Vq VDD- VGH。 此时像素电路的部分等效电路图可 如附图 7所示。 同时由于第四晶体管 T4处于导通状态， 有机发光二极管 OLED的阳极 与第二电平信号 VSS相连接， 这样在发光阶段存在于空穴传输层 /发光层 (或 发光层 /电子传输层：)界面处积累了未复合的多余空穴 (或电子)得以消耗， 减小 有机发光二极管 OLED由于电荷累积的形成的内建电场，延缓 OLED的老化。
第二阶段： 第一扫描信号 G(r跳变为高电平， 第二扫描信号 G +l) 电 压跳变为低电平， 发光控制信号 EM(n)仍然为高电平， 因此， 第一晶体管 T1 和放大晶体管 ATFT处于导通状态， 第二晶体管 T2至第七晶体管 T7全部处 于截止状态， 驱动晶体管 DTFT。 由于第二晶体管 T2截止， 第二电容 Cp电 容 p点悬空， 因此当第二扫描信号 G(n+1)电位跳变为低电平时， 通过第二电 容 Cp的耦合， 节点 p即放大晶体管 ATFT的栅极电位也会跟着向下跳变。至 于跳变多少， 分两种情况， 如果有手指 ( Finger)触摸， 由于手指与感应电极 S E之间会形成耦合电容 Cf， 因此 p点的电位为：
Vp=VDD+(VGL- VGH)* Cp/(Cp+Cf);
对于放大晶体管 TATFT的栅源电压 Vsg 、 :
Vsg=Vs-Vg=VDD-[VDD+(VGL-VGH)*Cp/(Cp+Cf)]=(VGH-VGL)*
Cp/(Cp+Cf);
因此通过感应线 Sense line的感应电流大小为：
Ise= a(Vsg-jVtha|)2= a(Vsg-jVtha|)2= a[(VGH-VGL)*Cp/(Cp+Cf)
-|Vtha|]2
此处 Vtha为放大晶体管 ATFT的阈值电压； Ka为放大晶体管 ATFT与工 艺和设计有关的常数。
如果没有手指触摸， 则 p点的电位为：
Vp=VDD-(VGH-VGL)；
对于放大晶体管 TATFT的栅源电压 Vsg为：
Vsg-Vs-Vg-VDD-[ VDD- (VGH- VGL)]= VGH-VGL;
通过感应线 Sense line的感应电流大小为：
Ise-Ka(Vsg-jVthaj)2- a(Vsg-|Vtha|)2- Ka[(VGII-VGL) - |Vtha|]2;
由此通过电流即可判断该处是否有手指触摸， 触摸导致的电流差异见图 5中的 I sense- line 。 此时像素电路的部分等效电路图可如附图 8所示。
同时， 第一控制单元 11、 驱动单元 12以及驱动晶体管 DTFT均处于截 止状态
第三阶段： 第一扫描信号 G(n为高电平、 第二扫描信号 G i+1) 和发光 控制信号 EM0Q)为低电平， 因此， 第二晶体管 T2、第四晶体管 Τ4、 第六晶体 管 Τ6、 第七晶体管 Τ7处于截止状态， 第一晶体管 Tl、第三晶体管 Τ3、 第五 晶体管 Τ5处于导通状态。 由于第五晶体管 Τ5开启， 第六晶体管 Τ6关闭， 第一电容 Cst的 m点不再与固定电位连接， 而与驱动晶体管 DTFT的栅极相 连， 由于驱动晶体管 DTFT的栅极处于悬空状态， 因此即便第一电容 Cst的 n 点与第一电平信号 VDD相连（因为第三晶体管 T3开启）， 第一电容 Cst两端 的电压仍然不会变化， 对于驱动晶体管 DTFT， 栅源电压：
Vsg= Vs- Vg=Vcst= Vdata+ 1 Vthd | - Vref ；
其中， |Vthd|为驱动晶体管 DTFT的阈值电压。
因此通过驱动晶体管 DTFT的饱和电流即有机发光二极管 OLED的发光 电流大小为：
Ioled=kd(Vsg-| Vthd |)2=k(Vdata+|Vthd卜 Vref - 1 Vthd |)2= k(Vdata-Vref)2; 其中， Kd为与工艺和驱动设计有关的常数。
由此可见驱动电流大小只与数据电压 Vdata和固定电压 Vref大小有关， 和驱动晶体管 TDTFT的阈值电压 |Vthd|没有关系了， 同时该像素电路也克服 了内阻对发光电流的影响。
此时像素电路的部分等效电路图可如附图 9所示。
通过以上阶段即完成了一行像素发光的驱动和触控的判断。
基于本发明实施例提供的像素电路， 本发明实施例还提供了一种有机发 光显示面板， 该有机发光显示面板具体可以包括上述本发明实施例提供的像 素电路。
本发明实施例还提供了一种显示装置， 该显示装置具体可以包括上述本 发明实施例提供的有机发光显示面板。
该显示装置具体可以为液晶面板、 液晶电视、 液晶显示器、 OLED 面 板、 OLED显示器、 等离子显示器或电子纸等显示装置。 本发明所述的像素电路、 有机发光显示面板与显示装置特别适合 LTPS (低温多晶硅技术） 制程下的 GOA 电路需求， 也可适用于非晶硅工艺下的 GO A电路。
本发明提供的像素电路及其驱动方法、 有机发光显示面板及显示装置， 通过直接将数据电压 Vdata输入到驱动晶体管 DTFT的栅极， 使得驱动晶体 管 DTFT栅极电位固定，同时利用第一电容 CST的自放电将驱动晶体管 DTFT 的阈值电压 Vthd保存在第一电容 CST中， 第一电容 CST的一个电极中引入固 定电位 （例如固定电压 Vref) 以消除线路内阻对发光电流的影响， 从而使有 机发光显示面板中不同位置处的 OLED驱动电流一致， 可改善有机发光显示 面板亮度的均匀性和可靠性。
同时， 本发明提供的像素电路中还设置有触摸信号侦测电路， 该触摸侦 测电路复用了 AMOLED发光驱动电路中的控制信号， 对触摸侦测电路中的 耦合电容进行充电， 并利用放大管晶体管 ( Amplify TFT, 即 ATFT) 对触摸 屏幕产生的触摸信号进行放大， 在不增加电路结构和操作复杂性的同时， 很 好的实现了触摸电路在面板上集成， 从而可实现内置型触摸屏和有机发光二 极管驱动显示的一体化， 有利于降低显示面板的厚度和重量， 并可降低显示 面板的成本。
另外， 本发明提供的像素电路还可以设置有用于消除有机发光二极管 OLED发光层界面处未复合载流子的第四晶体管 T4， 在第一扫描线开启的同 时使有机发光二极管 OLED的阳极短接到第二电平输入端例如 VSS， 从而可 消除有机发光二极管 OLED内部发光层界面累积的未复合的载流子， 减小有 机发光二极管 OLED由于电荷累积的形成的内建电场， 延缓有机发光二极管 OLED的老化。
需指出的是， 本发明实施例所提供的像素电路可适用于非晶硅、 多晶硅、 氧化物等工艺的薄膜晶体管。 同时， 尽管上述实施例中， 以单一采用 P型薄 膜晶体管为例进行了说明， 然而， 上述电路还可以轻易的改成采用单一的 N 型薄膜晶体管或 CMOS管电路； 此外， 还可以将触控功能部分去掉， 将该驱 动触控电路改为纯粹的像素发光驱动电路。 而且， 尽管上述实施例中以有源 矩阵有机发光二极管为例进行了说明， 然而本发明不限于使用有源矩阵有机 发光二极管的显示装置，也可以应用于使用其他各种发光二极管的显示装置。 以上所述仅是本发明的实施方式， 应当指出， 对于本技术领域的普通技 术人员来说， 在不脱离本发明原理的前提下， 还可以作出若千改进和润饰， 这些改进和润饰也应视为本发明的保护范围。

Claims

权利 要求书
1、 一种像素电路， 其特征在于， 包括： 驱动晶体管、 第一电容、 有机发 光二极管、 第一控制单元以及驱动单元； 其中：
所述驱动晶体管的漏极与所述有机发光二极管的阳极连接；
所述有机发光二极管的阴极与第二电平信号输入端连接；
所述第一控制单元分别与第一扫描信号输入端、 数据线、 固定电压输入 端、 所述第一电容、 所述驱动晶体管、 所述驱动单元连接， 用于在第一扫描 信号控制下， 将所述第一电容的第一端的电位控制为固定电压， 将数据电压 输入至所述驱动晶体管的栅极， 利用第一电容通过驱动晶体管的自放电使得 第一电容的第二端的电位保持为数据电压和驱动晶体管阈值电压之和；
所述驱动单元分别与发光控制信号输入端、 第一电平信号输入端、 所述 第一电容、 所述驱动晶体管、 所述第一控制单元连接， 用于在发光控制信号 控制下， 利用所述第一电容两端的压差作为驱动晶体管的栅源电压， 驱动有 机发光二极管发光。
2、如权利要求 1所述的像素电路，其特征在于，所述第一控制单元包括: 第六晶体管和第七晶体管； 其中- 所述第六晶体管的源极与所述固定电压输入端连接， 所述第六晶体管的 栅极与所述第一扫描信号输入端连接， 所述第六晶体管的漏极分别与所述第 一电容的第一端、 驱动单元连接于第一节点；
第七晶体管的源极与所述数据线连接， 所述第七晶体管的栅极与所述第 一扫描信号输入端连接，所述第七晶体管的漏极分别与所述驱动晶体管栅极、 所述驱动单元连接于第二节点。
3、如权利要求 1或 2所述的像素电路，其特征在于，所述驱动单元包括： 第三晶体管和第五晶体管； 其中- 所述第三晶体管的源极与所述第一电平信号输入端连接， 所述第三晶体 管的栅极与所述发光控制信号输入端连接， 所述第三晶体管的漏极分别与所 述第一电容的第二端、 驱动晶体管的源极连接于第三节点；
所述第五晶体管的源极与所述第二节点连接， 所述第五晶体管的栅极与 所述发光控制信号输入端连接，所述第五晶体管的漏极与所述第一节点连接。
4、 如权利要求 1-3中任一项所述的像素电路， 其特征在于， 还包括： 用于消除所述有机发光二极管发光层界面处未复合载流子的第四晶体 管；
所述第四晶体管的漏极与所述第二电平信号输入端连接， 所述第四晶体 管的栅极与所述第一扫描信号输入端连接， 所述第四晶体管的源极与所述有 机发光二极管的阳极连接。
5、 如权利要求 1-4中任一项所述的像素电路， 其特征在于， 还包括： 感 应电极、 放大晶体管、 第二电容、 充电单元以及第二控制单元； 其中：
所述感应电极分别与所述充电单元、 第二电容的第一端、 放大晶体管的 栅极连接于第四节点；
所述放大晶体管的源极与所述第一电平输入端连接， 所述放大晶体管的 漏极与所述第二控制单元连接；
所述第二电容的第二端与第二扫描信号输入端连接；
所述充电单元分别与第一扫描信号输入端、 第一电平输入端以及所述第 四节点连接， 用于在第一扫描信号控制下， 为所述第二电容充电；
所述第二控制单元分别与所述第二扫描信号输入端、 感应线、 所述放大 晶体管的漏极连接， 用于在所述第二扫描信号控制下， 将感应电极感应到的 触摸信号通过放大晶体管放大， 并将放大晶体管放大的信号电流通过第二控 制单元传输到感应线， 以使芯片确定是否被触摸。
6、 如权利要求 5所述的像素电路， 其特征在于， 所述充电单元包括： 第二晶体管；
所述第二晶体管的源极与所述第一电平信号输入端连接， 所述第二晶体 管的栅极与所述第一扫描信号输入端连接， 所述第二晶体管的漏极与所述第 四节点连接。
7、 如权利要求 5或 6所述的像素电路， 其特征在于， 所述第二控制单元 包括：
第一晶体管；
所述第一晶体管的源极与所述放大晶体管的漏极连接， 所述第一晶体管 的栅极与所述第二扫描信号输入端， 所述第一晶体管的漏极与所述感应线连
8、 如权利要求 2- 7任一项所述的像素电路， 其特征在于， 所述像素电路 中包括的晶体管为 P型晶体管；
所述第一电平信号输入端连接有高电平；
所述第二电平信号输入端连接有低电平。
9、 一种驱动如权利要求 1至 8中任一项所述像素电路的像素驱动方法， 其特征在于， 包括：
第一阶段， 第一控制单元将第一电容的第一端的电位控制为固定电压， 将数据电压输入至驱动晶体管的栅极， 利用第一电容通过驱动晶体管的自放 电使得第一电容的第二端的电位为数据电压和驱动晶体管阈值电压之和， 驱 动单元处于截止状态；
第二阶段， 第一控制单元、 驱动单元以及驱动晶体管均处于截止状态； 第三阶段， 第一控制单元和驱动晶体管处于截止状态， 驱动单元在发光 控制信号控制下， 利用第一电容两端的压差作为驱动晶体管的栅源电压， 驱 动有机发光二极管发光。
10、 如权利要求 9所述的方法， 其特征在于， 在第一阶段， 第六晶体管、 第七晶体管处于导通状态， 第三晶体管、 第五晶体管处于截止状态；
在第二阶段， 第三晶体管、 第五晶体管、 第六晶体管、 第七晶体管均处 于截止状态；
在第三阶段， 第三晶体管、 第五晶体管处于导通状态， 第六晶体管、 第 七晶体管处于截止状态。
11、 如权利要求 9或 10所述的方法， 其特征在于， 在第一阶段， 第四晶 体管处于导通状态；
在第二阶段， 第四晶体管处于截止状态；
在第三阶段， 第四晶体管处于截止状态。
12、 如权利要求 9-11中任一项所述的方法， 其特征在于， 在第一阶段， 第一扫描信号为低电平， 发光控制信号为高电平；
在第二阶段， 第一扫描信号为高电平， 发光控制信号为高电平； 在第三阶段， 第一扫描信号为高电平， 发光控制信号为低电平。
13、 如权利要求 9- 12中任一项所述的方法， 其特征在于， 还包括： 第一阶段， 充电单元利用第一电平信号为第二电容充电， 放大晶体管和 第二控制单元处于截止状态；
第二阶段和第三阶段， 充电单元处于截止状态， 第二控制单元将放大晶 体管放大的触摸信号电流传输至感应线。
14、 如权利要求 9-13中任一项所述的方法， 其特征在于， 在第一阶段， 第二晶体管处于导通状态， 第一晶体管处于截止状态；
在第二阶段， 第二晶体管处于截止状态、 第一晶体管处于导通状态； 在第三阶段， 第二晶体管处于截止状态、 第一晶体管处于导通状态。
15、 如权利要求 9-14中任一项所述的方法， 其特征在于， 在第一阶段， 第一扫描信号为低电平， 第二扫描信号为高电平；
在第二阶段， 第一扫描信号为高电平， 第二扫描信号为低电平； 在第三阶段， 第一扫描信号为高电平， 第二扫描信号为低电平。
16、 一种有机发光显示面板， 其特征在于， 包括所述权利要求 1-8任一 项的像素电路。
17、 一种显示装置， 其特征在于， 包括如权利要求 16所述的有机发光显
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